An acrobat performs during a presentation of the new show 'Aquatoria. Circus on Water' at the National Circus in Kyiv, Ukraine September 18, 2021. REUTERS/Valentyn Ogirenko TPX IMAGES OF THE DAY

Acrobats perform during a presentation of the new show 'Aquatoria. Circus on Water' at the National Circus in Kyiv, Ukraine September 18, 2021. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Aquatoria. Circus on Water' at the National Circus in Kyiv, Ukraine September 18, 2021. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Aquatoria. Circus on Water' at the National Circus in Kyiv, Ukraine September 18, 2021. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Aquatoria. Circus on Water' at the National Circus in Kyiv, Ukraine September 18, 2021. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Aquatoria. Circus on Water' at the National Circus in Kyiv, Ukraine September 18, 2021. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Aquatoria. Circus on Water' at the National Circus in Kyiv, Ukraine September 18, 2021. REUTERS/Valentyn Ogirenko

French acrobat Nathan Paulin walks on a slackline between the Eiffel Tower and the Theatre National de Chaillot as part of events around France for National Heritage Day in Paris, France, September 18, 2021. REUTERS/Benoit Tessier

French acrobat Nathan Paulin walks on a slackline between the Eiffel Tower and the Theatre National de Chaillot as part of events around France for National Heritage Day in Paris, France, September 18, 2021. REUTERS/Benoit Tessier TPX IMAGES OF THE DAY

French acrobat Nathan Paulin walks on a slackline between the Eiffel Tower and the Theatre National de Chaillot as part of events around France for National Heritage Day in Paris, France, September 18, 2021. REUTERS/Benoit Tessier

French acrobat Nathan Paulin walks on a slackline between the Eiffel Tower and the Theatre National de Chaillot as part of events around France for National Heritage Day in Paris, France, September 18, 2021. REUTERS/Benoit Tessier

French acrobat Nathan Paulin walks on a slackline between the Eiffel Tower and the Theatre National de Chaillot as part of events around France for National Heritage Day in Paris, France, September 18, 2021. REUTERS/Benoit Tessier

French acrobat Nathan Paulin walks on a slackline between the Eiffel Tower and the Theatre National de Chaillot as part of events around France for National Heritage Day in Paris, France, September 18, 2021. REUTERS/Benoit Tessier

French acrobat Nathan Paulin walks on a slackline between the Eiffel Tower and the Theatre National de Chaillot as part of events around France for National Heritage Day in Paris, France, September 18, 2021. REUTERS/Benoit Tessier

French acrobat Nathan Paulin walks on a slackline between the Eiffel Tower and the Theatre National de Chaillot as part of events around France for National Heritage Day in Paris, France, September 18, 2021. REUTERS/Benoit Tessier

Aerial acrobat, Eszter Kovacs, performs during a performance of the Utca-SZAK street theatre group, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, May 2, 2021. Picture taken May 2, 2021. REUTERS/Bernadett Szabo

Aerial acrobat, Eszter Kovacs, performs during a performance of the Utca-SZAK street theatre group, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, May 2, 2021. Picture taken May 2, 2021. REUTERS/Bernadett Szabo

Aerial acrobat, Eszter Kovacs, member of the Taurin Circus Group, practices at home, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, April 26, 2021. Picture taken April 26, 2021. REUTERS/Bernadett Szabo

Aerial acrobat, Eszter Kovacs, member of the Taurin Circus Group, practices with her cat, Dagi (Fatty) at home, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, April 26, 2021. Picture taken April 26, 2021. REUTERS/Bernadett Szabo

Aerial acrobat, Eszter Kovacs, member of the Taurin Circus Group, adjusts her costume at home, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, April 26, 2021. Picture taken April 26, 2021. REUTERS/Bernadett Szabo

Aerial acrobat, Eszter Kovacs, member of the Taurin Circus Group, practices at home, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, April 26, 2021. Picture taken April 26, 2021. REUTERS/Bernadett Szabo

Aerial acrobat, Eszter Kovacs, member of the Taurin Circus Group, practices at home, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, April 26, 2021. Picture taken April 26, 2021. REUTERS/Bernadett Szabo

Pole acrobat, Kata Ott-Balogh, member of the Taurin Circus Group practices at home, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, April 20, 2021. Picture taken April 20, 2021. REUTERS/Bernadett Szabo

Pole acrobat, Kata Ott-Balogh, member of the Taurin Circus Group practices at home as her daughter Tetisz plays on the pole, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, April 20, 2021. Picture taken April 20, 2021. REUTERS/Bernadett Szabo

Pole acrobat, Kata Ott-Balogh, member of the Taurin Circus Group hugs her daughter Tetisz as she practices at home, amid the coronavirus disease (COVID-19) pandemic, in Budapest, Hungary, April 20, 2021. Picture taken April 20, 2021. REUTERS/Bernadett Szabo

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Remo Casilli

Italy's acrobatic Air Force squadron fly over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Remo Casilli

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Remo Casilli

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Guglielmo Mangiapane

Italy's acrobatic Air Force squadron blaze the colours of the Italian flag over the capital as they celebrate the 98th anniversary of the establishment of the Air Force, in Rome, Italy, March 30, 2021. REUTERS/Remo Casilli

Acrobats perform during a presentation of the new show 'Ecolibrum’, dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

Passers-by look at acrobats performing inside of a closed bar amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

Passers-by look at acrobats performing inside of a closed bar amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

A passer-by looks at acrobats performing inside of a closed bar amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

A closed bar is seen behind acrobats performing in a window to cheer passers-by amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

Acrobats perform inside of a closed bar to cheer passers-by amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

Actors and acrobats Kira Davies and Pierre Quemard practice a maneuver at Washington Square Park as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., November 14, 2020. REUTERS/Caitlin Ochs

Acrobats perform during a presentation of the new show 'Birthday. Circus Festival' at the National Circus in Kyiv, Ukraine October 10, 2020. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Birthday. Circus Festival' at the National Circus in Kyiv, Ukraine October 10, 2020. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Birthday. Circus Festival' at the National Circus in Kyiv, Ukraine October 10, 2020. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Birthday. Circus Festival' at the National Circus in Kyiv, Ukraine October 10, 2020. REUTERS/Valentyn Ogirenko

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny TPX IMAGES OF THE DAY

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

An acrobat performs during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny