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This illusion is just a matter of perspective

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In the mood for a little visual trickery?  Click through to see four new optical illusions that'll challenge your perceptions and stimulate your thoughts.

SIDEWALK SPHERE: Created in Paris by Francois Abenalet, this ingenious sidewalk installation goes beyond the usual chalk drawings by incorporating actual grass and trees.  It's a classic example of anamorphosis -- a distorted image that only takes its "proper" form when viewed from exactly the right angle.

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Sidewalk Sphere

GEORGE WASHINGTON: America's first president gets a little homage in this illusion, which includes both a picture and a signature that work equally well when viewed upside-down.

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George Washington

HIDDEN ANIMAL: Can you spot the creature embedded in this tree?  If not, click here for a little help.

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Hidden Animal

IMPOSSIBLE ROOM: LEGO mastermind Henry Lim has used the plastic blocks to create a convincing three-dimensional version of M.C. Escher's famous mind-boggling lithograph, "Relativity."

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LEGO Escher

See more illusions at Mighty Optical Illusions.com! >>

See more brain teasers and brain games on Yahoo! >>

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