Spaceships Optical Illusion
In this new twist on an old optical illusion, two spaceships can be seen flying through a wormhole. The spaceship in the front appears to be significantly smaller (maybe half as big?) than the one behind it. Surprisingly, however, both spaceships are the exact same size. The wings of the spaceship in the back are close to the sides of the wormhole which gives the impression that it must be larger than the one in the front.
To see more examples of this illusion, be sure to check out a relative size illusion involving three SUVs and another that uses animation to get the point across.
(via Optical Spy)