Optical illusions come in many forms ... With its purple and yellow vortex-like design, this one’s hypnotic, but we promise it’s not a gif or a video. It’s a completely still image.

There's also a mirror maze and photogenic vortex tunnel in Bewilderworld ... Entry to Camera Obscura and World of Illusions costs 21.95 pounds (about $27) for adults and 16.95 pounds (about ...