04/04/2011 09:30 am ET | Updated Jun 04, 2011

International Pillow Fight 2011 In Union Square (PHOTOS)

Over 1,000 people filled New York City's Union Square on the afternoon of Sat., April 2, to participate in International Pillow Fight Day. Feathers filled the air as costumed combatants welcomed spring.

Other celebrations were held in cities around the world, from Adelaide, Australia, to Belo Horizonte, Brazil.

photos by Andrew Hinderaker