Tower Optical Illusion is a spectacular photo taken by Sabine form flicker.  This photo was taken down a street in Singapore.  The amazing thing that makes this is an optical illusions is the same picture when placed side by side gives a different perspective of the same image. Look at the clouds and the tower beside the building each one appears to be leaning a different direction.  Also check out a similar Leaning Tower Optical Illusion for another example of this great optical illusion.

Leaning Tower Optical Illusion