The image looks like a spiral pattern at first glance, but if you examine it closely you'll find two words hiding in plain sight.
You might have great depth perception in real life. But 2D drawings play tricks on your brain.
Optical illusions like this are the reason we have trust issues.
The black hole in this optical illusion isn't really expanding, but your brain might assume otherwise.
How do rainbows form? It’s all about light waves, water, and angles—and that includes the angle from which you see one.