Across the globe, sculptures have become a great medium for artistic expression. In fact, artists have been using sculptures for thousands of years to create pieces that challenge traditional form, that stun audiences, and that play clever tricks on the mind. French artist Edgar Degas explained it best when he said “art is not what you see, it's what you make others see” and this could not be truer when looking at some of the more contemporary sculptures around the world today that almost call into the question the laws of gravity and physics. Here are 10 of our favorites: