A general view shows houses decorated with lanterns and lights during the Tihar festival, also called Diwali, the Hindu festival of lights in Kathmandu, Nepal, October 27, 2019. REUTERS/Navesh Chitrakar

A general view shows houses decorated with lanterns and lights during the Tihar festival, also called Diwali, the Hindu festival of lights in Kathmandu, Nepal, October 27, 2019. REUTERS/Navesh Chitrakar

The Aurora Borealis (Northern Lights) is seen in the sky in Ivalo of Lapland, Finland September 27, 2019. Picture taken September 27, 2019. REUTERS/Alexander Kuznetsov TPX IMAGES OF THE DAY

The Aurora Borealis (Northern Lights) is seen in the sky in Ivalo of Lapland, Finland September 27, 2019. Picture taken September 27, 2019. REUTERS/Alexander Kuznetsov

The Aurora Borealis (Northern Lights) is seen in the sky in Ivalo of Lapland, Finland September 27, 2019. Picture taken September 27, 2019. REUTERS/Alexander Kuznetsov

Sky lanterns float during Christmas festivities in Volos, Greece, December 26, 2018. Picture taken December 26, 2018. REUTERS/Alexandros Avramidis

A general view shows houses decorated with lanterns and lights during the Tihar festival, also called Diwali, the Hindu festival of lights in Kathmandu, Nepal November 7, 2018. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY

Lanterns are pictured outside Notre Dame Cathedral, waiting for children to find out how the watchman (guet) announces the time by yelling the hour from 10 pm to 2 am, 365 days a year, a tradition started in 1405 and preserved without interruption to this day and which initially was introduced to warn about fires, in Lausanne, Switzerland, November 3, 2018. REUTERS/Denis Balibouse

The flame of Samhain is presented at the start of a procession up the hill of Tlachtga as part of the Flame of Samhain festival, in Athboy, Ireland, October 31, 2018. Samhain is believed to be the ancient precursor to Halloween and marks the end of the old Celtic year and the beginning of the new year where the spirits of the dead are passed onto the next world. REUTERS/Clodagh Kilcoyne

A candle is seen in a grave lantern at the central cemetery ahead of All Saints Day in Vienna, Austria, October 30, 2018. REUTERS/Lisi Niesner

A general view shows the sea along the Mazatlan coast as Hurricane Willa approaches the Pacific beach resort, Mexico October 23, 2018. REUTERS/Henry Romero

A general view shows the sea along the Mazatlan coast as Hurricane Willa approaches the Pacific beach resort, Mexico October 23, 2018. REUTERS/Henry Romero

A general view shows the Malecon as Hurricane Willa approaches the Pacific beach resort of Mazatlan, Mexico October 23, 2018. REUTERS/Henry Romero

A general view shows the Malecon as Hurricane Willa approaches the Pacific beach resort of Mazatlan, Mexico October 23, 2018. REUTERS/Henry Romero

Construction cranes are seen at an apartment complex under construction in Madrid, Spain, October 22, 2018. REUTERS/Susana Vera

A general view shows the International Court of Justice in The Hague, Netherlands August 27, 2018. REUTERS/Piroschka van de Wouw

The collapsed Morandi Bridge is seen in the Italian port city of Genoa, Italy August 14, 2018. REUTERS/Stefano Rellandini

A lantern is seen in the street in the Old Town of Tallinn, Estonia, August 13, 2018. REUTERS/Maxim Shemetov

A pigeon stands in front of the Bank of England in London, Britain, April 9, 2018. Picture taken April 9, 2018. REUTERS/Hannah McKay

A man plays with a dog after snowfall at Prospect Park in Brooklyn, New York, U.S., April 2, 2018. REUTERS/Shannon Stapleton

Flag of Belarus is lowered at half-mast on the day of national mourning in Russia for the victims of a shopping mall fire in Kemerovo, in Minsk, Belarus March 28, 2018. REUTERS/Vasily Fedosenko

A sign is displayed on an artificial island with an entrance to an undersea tunnel, at a section of the Hong Kong-Zhuhai-Macau Bridge, to be opened in Zhuhai, China March 28, 2018. REUTERS/Bobby Yip

A section of the Hong Kong-Zhuhai-Macau Bridge leads to an artificial island, to be opened in Zhuhai, China March 28, 2018. REUTERS/Bobby Yip

The flag of Belarus is lowered at half-mast on the day of national mourning in Russia for the victims of a shopping mall fire in Kemerovo, at the Russian embassy in Minsk, Belarus March 28, 2018. REUTERS/Vasily Fedosenko

A walker crosses a snow-covered Clapham Common in London, Britain, March 18, 2018. REUTERS/Hannah McKay

Thousands of believers join Buddhist monks praying at the Wat Phra Dhammakaya temple during a ceremony on Makha Bucha Day in Pathum Thani, Thailand, March 1, 2018. REUTERS/Athit Perawongmetha

A man walks on the footpath on the outskirts of St. Petersburg, Russia February 22, 2018. REUTERS/Maxim Shemetov

A man hangs a lantern for the Chinese Lunar New Year at Mahayana Buddhist Temple in Manhattan, in New York, U.S., February 16, 2018. REUTERS/Gabriela Bhaskar

Decorations for the upcoming Chinese Lunar New Year are pictured near a park on a polluted day in Beijing, China February 13, 2018. Picture taken February 13, 2018. REUTERS/Jason Lee

A lunar eclipse of a full "Blue Moon" is seen above a statue at the Chhatrapati Shivaji Terminus railway station in Mumbai, India, January 31, 2018. REUTERS/Danish Siddiqui

A Blue Moon comes out of a lunar eclipse as it sets past an ocean pier in Oceanside, California, U.S., January 31, 2018. REUTERS/Mike Blake

A street-lamp is seen on the flooded banks of the Seine River in Paris, France, after days of almost non-stop rain caused flooding in the country, January 24, 2018. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY

Fireworks explode over the St. Sava monument during the Orthodox Christian New Year's Day celebrations in Belgrade, Serbia, January 14, 2018. REUTERS/Djordje Kojadinovic

Pilgrims hold candles during the Corpus Domini procession led by Pope Francis at the Basilica of Santa Maria Maggiore in Rome, Italy June 18, 2017. REUTERS/Tony Gentile TPX IMAGES OF THE DAY

A reveller wears a mask during carnival celebrations in Gijon, northern Spain, February 27, 2017. REUTERS/Eloy Alonso

A reveller wears a mask during carnival celebrations in Gijon, northern Spain, February 27, 2017. REUTERS/Eloy Alonso

People visit a light show celebrating the Lantern Festival, the last day of Chinese Lunar New Year celebrations, in Beijing, China February 11, 2017. REUTERS/Jason Lee TPX IMAGES OF THE DAY

Participants release sky lanterns during the "Christmas light of wishes" event in Zagreb, Croatia, December 17, 2016. REUTERS/Antonio Bronic TPX IMAGES OF THE DAY

People walk along an alley in al-Jdeideh neighbourhood, in the Old City of Aleppo, Syria December 12, 2009. Picture taken December 12, 2009. REUTERS/Khalil Ashawi TPX IMAGES OF THE DAY

A family wait to release their lanterns as people gather to release floating lights in Islamabad, Pakistan November 26, 2016. REUTERS/Caren Firouz TPX IMAGES OF THE DAY

People hold up floating lanterns before they release during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People release floating lanterns during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People hold up floating lanterns before they release during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People hold up floating lanterns before they release during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People release floating lanterns during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

Floating lanterns are pictured during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha TPX IMAGES OF THE DAY

People hold up floating lanterns before they release during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People release floating lanterns during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People release floating lanterns during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People release floating lanterns during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People hold up floating lanterns before they release during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha

People release floating lanterns during the festival of Yee Peng in the northern capital of Chiang Mai, Thailand November 14, 2016. REUTERS/Athit Perawongmetha TPX IMAGES OF THE DAY

Oxford Street's Christmas lights are illuminated in London, Britain November 6, 2016. REUTERS/Neil Hall

Oxford Street's Christmas lights are illuminated in London, Britain November 6, 2016. REUTERS/Neil Hall

Oxford Street's Christmas lights are illuminated in London, Britain November 6, 2016. REUTERS/Neil Hall

Oxford Street's Christmas lights are illuminated in London, Britain November 6, 2016. REUTERS/Neil Hall

People decorate their houses with lanterns and lights as they celebrate the annual Hindu festival of Diwali in Mumbai, India, October 30, 2016. REUTERS/Danish Siddiqui

A girl dressed as the Virgin Mary pose for a photo during the Lantern Festival celebrating the eve of the nativity of the Virgin Mary in Ahuchapan, El Salvador September 7, 2016. REUTERS/Jose Cabezas

A girl dressed as the Virgin Mary poses for a photo during the Lantern Festival celebrating the eve of the nativity of the Virgin Mary in Ahuchapan, El Salvador September 7, 2016. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY

A woman lights up candles during the Lantern Festival celebrating the eve of the nativity of the Virgin Mary in Ahuchapan, El Salvador September 7, 2016. REUTERS/Jose Cabezas