One of the coolest optical illusions I’ve ever seen…
Most people will see the girl spinning clockwise initially, but the girl can be seen rotating anti-clockwise as well, depending on how your brain works.
A small tip – focus below the hip to ‘change’ the direction. If you still can’t see it after some time, cover the upper body part and just focus on the legs.
[Update] The brilliant illusion is created by Japanese designer Nobuyuki Kayahara. You can visit his official site for some other works (not just optical illusions).