Stacked Bricks Optical Illusion

Are the bricks stacked faced down on the right or on their edge against a wall on the left? Can you see it both ways?

See Another Random Optical Illusion

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Explanation

This optical illusion works because we try assign a three dimensional aspect to the picture without it actually being represented in the two dimensional optical illusion image. We are constantly trying to make a three dimensional map from the image data which only provides us with clues.