Awesome Interactive Drawings.

Here are a few beautiful masterpieces created with only a pencil or a paintbrush. Though its not a secret that the artists use Photoshop to make these paintings more realistic and impressive, but still the results are very impressive. And when one talks of optical illusion art, you cant miss M. C. Escher, who has inspired the likes of many artists with his optical illusion art. Well known examples of his work includes Drawing Hands - 1948 (the last image of this post), a work in which two hands are shown, each drawing the other.

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