Buildings reflected in a soap bubble during the performance of a street artist in Cologne, Germany, October 16, 2015. (Photo by Oliver Berg/EPA)





A man circles a tourist in a giant soap bubble at Columbus Circle near Central Park in New York on a warm summer day July 21, 2015. (Photo by Mike Segar/Reuters)





A woman dances in a cloud of bubbles while marching in a gay pride parade in San Francisco, California June 28, 2015. (Photo by Elijah Nouvelage/Reuters)





A street vendor blows bubbles on the street in a region of the South Bronx that has seen a deadly outbreak of Legionnaires' disease in New York August 7, 2015. (Photo by Lucas Jackson/Reuters)





A migrant child plays with bubbles at Keleti railway station in Budapest, Hungary, September 6, 2015. (Photo by David W. Cerny/Reuters)





A migrant child blows soap bubbles at a transit camp in Gevgelija, Macedonia, after entering the country by crossing the border with Greece, September 29, 2015. (Photo by OgnenTeofilovski/Reuters)





A man makes giant bubbles on Belvedere Terrace during a warm afternoon in New York's Central Park in Manhattan, October 8, 2015. (Photo by Mike Segar/Reuters)





A street seller teaches a boy how to make soap bubbles, on Piazza del Popolo, a touristic square in central Rome at sunset on July 2, 2015. (Photo by Gabriel Bouys/AFP Photo)





A blurred panaroma of Roemerberg historic center is reflected in a soap bubble in Frankfurt am Main, Germany, 09 July 2015. (Photo by Frank Rumpenhorst/EPA)





Frankfurt's city hall, the so-called “Roemer” (lit. Roman) is mirrored in a soap bubble in Frankfurt am Main, Germany, 24 July 2015. The medieval building complex in the old part of the city is one of Frankfurt's landmarks and houses the city hall since the 15th century. (Photo by Frank Rumpenhorst/EPA)





Children enjoy flying soap bubbles during the 5th Bubble Blowing Day on Margaret Island in Budapest, Hungary, 23 August 2015. (Photo by Bea Kallos/EPA)





Robert, who is known as “The Bubble Wizard”, entertains kids with bubbles in Old Montreal, Friday, July 24, 2015, in Montreal. (Photo by Ryan Remiorz/The Canadian Press via AP Photo)





A street artist performs with soap bubbles in front of the Duomo gothic cathedral, in Milan, Italy, Tuesday, October 20, 2015. (Photo by Luca Bruno/AP Photo)





Children play with a giant soap bubble in the streets of Old Havana, Cuba, Wednesday, September 16, 2015. (Photo by Ramon Espinosa/AP Photo)





Ellana Kruger, 3, gets excited about making big bubbles at the 2015 Gather-In at Pitt Park in Pittsfield, Mass., Saturday, July 25, 2015. (Photo by Stephanie Zollshan/The Berkshire Eagle via AP Photo)





Paul Pedro, of Springfield, Ore., creates a flying cloud of soap bubbles at Skinner Butte Park in Eugene, Ore., Tuesday September 8, 2015. He was using custom sticks and ropes to make elaborate and ever changing bubble creations to the delight of visitors to the park. (Photo by Chris Pietsch/The Register-Guard via AP Photo)





A student blows bubbles on the first day of the university introduction days for students in the Wilhelminapark in Utrecht, the Netherlands, 10 August 2015. First year students attend introduction days ahead of their studies. (Photo by Bas Czerwinski/EPA)