Optical delusions are when your eye sees one thing in an image because it's become accustomed to that kind of image in that context. In the cases of the following images, if you see the "dirty images" then you, unfortunately, have a dirty mind. If you see what's really there, then you're a healthy, good-hearted, well-meaning, functioning member of society.

So here's a list of things that look dirty, but aren't. And for more awesomeness, check out 50+ Trippy Pics That Will WTF Your Brain and 59 Infuriating Images That Will Trigger Your OCD.