“If you are near to this picture, Mr Angry is on the left and Mrs Calm is on the right. If you view it from a distance, they switch places!”
This is a pretty cool optical illusion. I just wish the faces could have been a bit easier to look at, but I guess attractiveness and androgeny are fairly mutually exclusive.
If you have a hard time seeing the illusion, there are better methods of viewing listed on the original site: LINK