‘Umschreibung,’ a sculpture by artist Olafur Eliasson in Munich, Germany (© Manfred Bail/Alamy)

Hummock ice on Lake Peipus in Estonia (© Sven Zacek/Minden Pictures)

Bison in Wind Cave National Park, South Dakota (© Charlie Summers/Minden Pictures)

Breckenridge, Colorado (© Sean Pavone/Shutterstock)

Wool and mohair yarn (© Jurate Buiviene/Alamy)

Black Fell, Lake District, England (© Daniel Kay/Shutterstock)

Harbin International Ice and Snow Sculpture Festival, Harbin, China (© STR/AFP via Getty Images)

Earth as seen from the International Space Station (© JSC/NASA)

Sandhill cranes, Bosque del Apache National Wildlife Refuge, New Mexico (© Jay Goodrich/Tandem Stills + Motion)

Hohenzollern Castle, Germany (© Sahara Prince/Shutterstock)