From Grand Illusions.

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This optical illusion is also known as an ambiguous object – an object that changes its appearance depending on the direction you view it from.

Viewed from one direction, this object shows the four card suits – diamonds, clubs, hearts and spades. However view it from the other direction – or turn it through 180 degrees – and now you only see four hearts! Note that the four hearts are the right way up when you view them, and when viewed from the other direction, the single heart is still upright!

Created by Kokichi Sugihara, a Japanese mathematician and artist known for his three-dimensional optical illusions. His illusions, which often involve videos of three-dimensional objects shown from carefully chosen perspectives, have won a number of awards at the Best Illusion of the Year Contest.