Last year, the internet went wild for a rotating horse. In the optical illusion, it wasn't clear in which direction the horse was rotating – and in this new, somewhat similar example, it isn't clear in which direction another horse is walking. There's just something about indeterminately moving horses, huh?
The equine illusion has stumped the internet, with some seeing the horse walk forwards, and others seeing it walk backwards (this writer is in the latter camp). And according to some, this determines whether the viewer is left or right-brained. (Looking for more mind-bogglers? Check out the best optical illusions of all time.)
