An eye-popping optical illusion created by Parisian artist François Abelanet is on display outside Paris City Hall. This work of art looks like a giant grass sphere, but it’s actually flat.
This land art is an anamorphosis which is a distorted projection that comes to life when viewed at the proper angle. Stand to the side and you will see angular grass and dirt. Stand at the correct angle and the 3D image jumps out at you.
Found at Gizmodo