A missing cat poster also became a creepy optical illusion.
As you walk past the poster, the cat's face appears to follow. When the viewer veers left, the cat's head turns to watch. When you lean right, so does the missing cat.
"Probably escaped from Azkaban or something," the Redditor who posted the video said.
But it's not a dark magic power -- it's actually a pretty common optical illusion used in haunted houses. If you put concave cones behind the eyes of the illusion, it'll look like the eyes will follow the viewer. Since the cat's head is perfectly placed over a concave surface, it appears to turn its whole head as the viewer passes by.
