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17 Mind-Mangling Optical Illusion GIFs

Don't believe what your eyes tell you.

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1. Stare at the black cross and see the blank space transform into a green dot.

2. Move your eyes above this line and the black and white dots will look like they're rotating clockwise.

moillusions.com

But focus on the central red or yellow dots and the outer ones reverse to show their true direction – counter-clockwise.

3. Keep looking at the flashing green dot and the yellow ones will disappear.

michaelbach.de

That'll be the Troxler effect again. Explanation here.

4. Fix your eyes on this black dot and the grey stripe will turn blue.

5. Watch dark bands appear as these concentric circles pass over each other

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It's called the Moiré pattern.

6. These still images start moving once a grating is passed over them.

7. Look, even this cat sees it.

8. This is a Penrose triangle, also known as the impossible triangle because how does it work?!

Via moillusions.com

Look at any two sides and it appears to be normal, but the third never quite seems right.

9. Well, this makes it much clearer...

Via moillusions.com

You can't actually make a real Penrose triangle in ordinary space.

10. Cats or birds?

11. These three cars are different sizes, right?

Nope, they're all the same.

Via neatorama.com!niCTK

This is an example of the Ponzo illusion. Italian psychologist Mario Ponzo suggested that we judge an object's size based on its background. So if something is the same size as another object but looks "further away" because of the background, we'll think it's bigger.

12. Which way is this train going?

Via moillusions.com

This is a variation on the classic spinning dancer illusion.

13. These yellow and blue blocks look like they're stepping alternately over the stripes.

michaelbach.de

But in fact they are always parallel, as you can see when the stripes disappear.

14. These blue lines look like they're moving in pairs.

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Until the green squares appear over them, making them a square.

15. Where does the extra square in this triangle go?

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Solution here.

16. Look at this black dot and see the outlines filled in with colour.

17. Finally, watch this for a minute or two, then look away.

Via en.wikipedia.org

But maybe don't operate any heavy machinery for a while.