A worker cleans the sign at a cafe of the local coffee house chain Soloist Coffee in Beijing, China, July 6, 2020. Picture taken July 6, 2020. REUTERS/Thomas Peter 

Yuhui Choe, First Soloist of The Royal Ballet practices as her husband, former Principal of the Royal Ballet, Nehemiah Kish works at their home in Wimbledon, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 1, 2020. REUTERS/Hannah McKay 

Yuhui Choe, First Soloist of The Royal Ballet practices as her husband, former Principal of the Royal Ballet, Nehemiah Kish works at their home in Wimbledon, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 1, 2020. REUTERS/Hannah McKay 

Yuhui Choe, First Soloist of The Royal Ballet practices as her husband, former Principal of the Royal Ballet, Nehemiah Kish works at their home in Wimbledon, following the coronavirus disease (COVID-19) outbreak in London, Britain, May 1, 2020. REUTERS/Hannah McKay TPX IMAGES OF THE DAY 

Yuhui Choe, First Soloist of The Royal Ballet practices as her husband, former Principal of the Royal Ballet, Nehemiah Kish works at their home in Wimbledon, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 1, 2020. REUTERS/Hannah McKay 

Yuhui Choe, First Soloist of The Royal Ballet practices as her husband, former Principal of the Royal Ballet, Nehemiah Kish works at their home in Wimbledon, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 1, 2020. REUTERS/Hannah McKay 

Yuhui Choe, First Soloist of The Royal Ballet practices as her husband, former Principal of the Royal Ballet, Nehemiah Kish works at their home in Wimbledon, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 1, 2020. REUTERS/Hannah McKay 

Yuhui Choe, First Soloist of The Royal Ballet practices as her husband, former Principal of the Royal Ballet, Nehemiah Kish works at their home in Wimbledon, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 1, 2020. REUTERS/Hannah McKay 

Yuhui Choe, First Soloist of The Royal Ballet practices as her husband, former Principal of the Royal Ballet, Nehemiah Kish works at their home in Wimbledon, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 1, 2020. REUTERS/Hannah McKay 

French Cancan soloist Olga Khokhlova, a dancer from ex-Soviet Kazakhstan, poses in a car as she arrives at the Moulin Rouge prior to dancing in the "Feerie" review, in Paris, France, October 30, 2018. Khokhlova has been at the Moulin Rouge for 12 years. "I love the adrenaline of the stage. The Moulin is a magical place where I live out my passion" she said. "When I’m on stage, I know that I am the inheritor of famous dancers who for 130 years have made the Moulin Rouge". REUTERS/Philippe Wojazer SEARCH "MOULINROUGE WOJAZER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. THE IMAGES SHOULD ONLY BE USED TOGETHER WITH THE STORY - NO STAND-ALONE USES. 

French Cancan soloist Olga Khokhlova, a dancer from ex-Soviet Kazakhstan, performs at the Moulin Rouge in Paris, France, July 4, 2018. Khokhlova has been at the Moulin Rouge for 12 years. "I love the adrenaline of the stage. The Moulin is a magical place where I live out my passion" she said. "When I’m on stage, I know that I am the inheritor of famous dancers who for 130 years have made the Moulin Rouge." REUTERS/Philippe Wojazer SEARCH "MOULINROUGE WOJAZER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. THE IMAGES SHOULD ONLY BE USED TOGETHER WITH THE STORY - NO STAND-ALONE USES. 

French Cancan soloist Olga Khokhlova, a dancer from ex-Soviet Kazakhstan, performs in the review "Feerie" at the Moulin Rouge, in Paris, France, November 11, 2017. Khokhlova has been at the Moulin Rouge for 12 years. "I love the adrenaline of the stage. The Moulin is a magical place where I live out my passion" she said. "When I’m on stage, I know that I am the inheritor of famous dancers who for 130 years have made the Moulin Rouge." REUTERS/Philippe Wojazer SEARCH "MOULINROUGE WOJAZER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. THE IMAGES SHOULD ONLY BE USED TOGETHER WITH THE STORY - NO STAND-ALONE USES. TPX IMAGES OF THE DAY. 

A soloist from the Israeli Opera sings during an open rehearsal of Giacomo Puccini's "Madama Butterfly" at the Mahane Yehuda market in Jerusalem, ahead of the Israel Festival, June 6, 2018. REUTERS/Ronen Zvulun TPX IMAGES OF THE DAY 

A soloist from the Israeli Opera sings during an open rehearsal of Giacomo Puccini's "Madama Butterfly" at the Mahane Yehuda market in Jerusalem, ahead of the Israel Festival, June 6, 2018. REUTERS/Ronen Zvulun 

A soloist from the Israeli Opera sings during an open rehearsal of Giacomo Puccini's "Madama Butterfly" at the Mahane Yehuda market in Jerusalem, ahead of the Israel Festival, June 6, 2018. REUTERS/Ronen Zvulun 

A man dances next to a soloist from the Israeli Opera during an open rehearsal of Giacomo Puccini's "Madama Butterfly" at the Mahane Yehuda market in Jerusalem, ahead of the Israel Festival, June 6, 2018. REUTERS/Ronen Zvulun 

Prima ballerina Deborah Ribeiro, soloist of the Rio de Janeiro's Municipal Theatre, performs during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes TPX IMAGES OF THE DAY 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, gets ready prior to her presentation during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes TPX IMAGES OF THE DAY 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, gets ready prior to her presentation during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, concentrates prior to her presentation during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, concentrates prior to her presentation during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, performs during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, concentrates prior to her presentation during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, greets a musician after her presentation during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Prima ballerina Deborah Ribeiro, soloist of the Rio de Janeiro's Municipal Theatre, performs during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, concentrates prior to her presentation during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, concentrates prior to her presentation during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes 

Soloist Ray Bauwens performs the final act of The Incompetance Opera as he is surrounded by Nobel laureates Eric Maskin, left, Oliver Hart, second from right, and Roy Glauber, right, during the 27th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S. September 14, 2017. REUTERS/Gretchen Ertl 

Russian Bolshoi Theatre ballet soloist Maria Vinogradova performs during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloists Ivan Vasiliev and Maria Vinogradova perform during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloists Ivan Vasiliev and Maria Vinogradova perform during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloists Ivan Vasiliev and Maria Vinogradova perform during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloist Maria Vinogradova performs during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloist Maria Vinogradova performs during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloists Ivan Vasiliev and Maria Vinogradova perform during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloist Maria Allash performs during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloists Ivan Vasiliev and Maria Vinogradova perform during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloist Maria Vinogradova performs during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloist Ivan Vasiliev performs during the premiere of "Crystal Palace" by Russian contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Russian Bolshoi Theatre ballet soloists Ivan Vasiliev and Maria Vinogradova perform during the premiere of "Crystal Palace" by RussIan contemporary composer Alexey Shor, as part of the celebrations commemorating the 50th anniversary of diplomatic relations between Malta and Russia, in Valletta, Malta, July 21, 2017. Picture taken July 21, 2017. REUTERS/Darrin Zammit Lupi 

Soloist Timmy Kelly sings the U.S. National Anthem at the start of the second day of the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 26, 2016. REUTERS/Mike Segar 

A costumier helps to a ballet soloist Valeria Zapasnikova put on a costume before performing in Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, Russia November 20, 2015. Picture taken November 20, 2015 REUTERS/Grigory Dukor 

Ballet soloist Valeria Zapasnikova gets her make-up done before performing in Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, Russia November 20, 2015. Picture taken November 20, 2015 REUTERS/Grigory Dukor 

A first soloist Sabina Yapparova and ballet dancer Mario Labrador perform as repetiteurs Evgenia Kostyleva (L) and Kirill Myasnikov react during a rehearsal of The Nutcracker choreographed by Nacho Duato at Mikhailovsky theatre in St. Petersburg, Russia November 17, 2015. Picture taken November 17, 2015 REUTERS/Grigory Dukor 

A ballet soloist Valeria Zapasnikova and first soloist Andrey Kasyanenko perform Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, Russia November 21, 2015. Picture taken November 21, 2015 REUTERS/Grigory Dukor 

A ballet soloist Valeria Zapasnikova performs Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, Russia November 21, 2015. Picture taken November 21, 2015 REUTERS/Grigory Dukor 

A ballet soloist Valeria Zapasnikova (C) and principal dancer Leonid Sarafanov (R) talk with repetiteur Zhanna Ayupova after the performance in Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, Russia November 21, 2015. Picture taken November 21, 2015 REUTERS/Grigory Dukor 

First soloist Andrey Kasyanenko talks with repetiteur Zhanna Ayupova after the performance in Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, Russia November 21, 2015. Picture taken November 21, 2015 REUTERS/Grigory Dukor 

A physiotherapist massages a ballet soloist Valeria Zapasnikova during Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, Russia November 21, 2015. Picture taken November 21, 2015 REUTERS/Grigory Dukor 

A ballet soloist Valeria Zapasnikova has a lunch before performing in Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, Russia November 21, 2015. Picture taken November 21, 2015 REUTERS/Grigory Dukor 

Ballet soloist Valeria Zapasnikova puts on her pointe shoes before performing in Nacho Duato's The Nutcracker at the Mikhailovsky theatre in St. Petersburg, November 20, 2015. Picture taken November 20, 2015 REUTERS/Grigory Dukor 

Ballet soloist Valeria Zapasnikova (L) and principal dancer Leonid Sarafanov perform in Nacho Duato's "The Nutcracker" at the Mikhailovsky Theatre in St. Petersburg, Russia November 20, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 26 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES TPX IMAGES OF THE DAY

Ballet soloist Valeria Zapasnikova blows into one of her pointe shoes to warm it up before a rehearsal of "The Nutcracker" choreographed by Nacho Duato at the Mikhailovsky Theatre in St. Petersburg, Russia November 20, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 16 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES 

Ballet soloist Tatiana Miltseva adjusts her pointe shoes as she prepares backstage for a performance of Nacho Duato's "The Nutcracker" at the Mikhailovsky Theatre in St. Petersburg, Russia November 21, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 12 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES 

Ballet soloist Sergey Strelkov performs during a rehearsal of "The Nutcracker" choreographed by Nacho Duato at the Mikhailovsky Theatre in St. Petersburg, Russia November 17, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 9 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES 

Ballet soloist Valeria Zapasnikova (L) and principal dancer Leonid Sarafanov © follow the instructions of repetiteur Zhanna Ayupova during a rehearsal of "The Nutcracker" choreographed by Nacho Duato at the Mikhailovsky Theatre in St. Petersburg, Russia November 17, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 5 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES 

Anastasia Soboleva, first soloist, stretches during practice at the Mikhailovsky Theatre in St. Petersburg, Russia November 20, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 2 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES 

Ballet soloist Valeria Zapasnikova (L) and principal dancer Leonid Sarafanov perform during a rehearsal of "The Nutcracker," choreographed by Nacho Duato, at the Mikhailovsky Theatre in St. Petersburg, Russia November 18, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 3 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES 

Ballet soloist Valeria Zapasnikova lies exhausted on the floor during a rehearsal of "The Nutcracker" choreographed by Nacho Duato at the Mikhailovsky Theatre in St. Petersburg, Russia November 19, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 4 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES 

Anastasia Soboleva, first soloist, chooses her pointe shoes for practice at Mikhailovsky Theatre in St. Petersburg, Russia November 20, 2015. For theatregoers in St Petersburg, Nacho Duato's "The Nutcracker" demonstrates the global appeal of a Christmas classic. When the curtain rises at the Mikhailovsky Theatre, among the oldest opera and ballet houses in Russia, it's the culmination of hundreds of hours of toil and sweat by dancers, costume makers, set designers and musicians playing the famous score by Pyotr Tchaikovsky. REUTERS/Grigory Dukor PICTURE 1 OF 31 - SEARCH "DUKOR NUTCRACKER" FOR ALL IMAGES