Optical Illusion: when is a yard a globe?

(CBS) - Optical illusions are gorgeous. So is Paris. How about an incredible optical illusion in front of Paris' Town Hall? Yes please. (Watch until the end.)

Is your mind blown? Our mind was pretty blown. Not only is the illusion incredible, but the lawn itself looks awesome even from other angles. Is anyone else getting an "Alice in Wonderland" vibe? Or maybe it's just an "incredible public work of art" vibe.