(Photos: World Balloon Convention)
Starting in 2010, the Pioneer Balloon Company has hosted the annual World Balloon Convention. It's a celebration and competition of balloon art. This year, 800 artists from 54 nations traveled to Denver, Colorado to show off their skills. 31 instructors offered classes to visitors who wanted to learn to create amazing sculptures like these.
You can see more photos of balloon sculptures from the convention at Pleated Jeans.