Warning: the following images are absolutely terrifying at first glance. This Zebra looks like it's doing a headstand, after having lost all four of its legs to some predators. But the longer you stare at these images, the more you start to understand what's actually going on in them. So if you want to see some truly crazy perspectives and how much they can mess with your perceptions, then scroll on and prepare to be confused, terrified and ultimately amused.