When you consider that we can only see things because of the light reflected off them, our eyes and brain seem pretty amazing. But, they can be easily tricked and manipulated into seeing things we can’t normally see.

Below are some of the most interesting examples, that’ll leave you questioning everything…

See Also: No One Can Agree On The Answer To This Simple Kids Puzzle

• ### 1. Stare at the dot in this image for 10 seconds...

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It should leave an imprint of color when the image fades to black and white. If you brain thinks an image should be color, it’ll automatically fill it in for you. Blink and it’ll fade.

• ### There's a similar effect on these flowers.

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• ### 3. Where does the space in this triange come from?

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Although it’s hard to tell with the human eye, the slope of each triangle is slightly different. This slight change is what creates the hole.

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• ### Here's a replica to prove it...

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Our brains will adjust color based on surrounding shadows. Since B is in the shade of the green cylinder, but is still the same color as A, the brain believes that it’s a lighter shade of grey.

• ### 7. Here's an illusion that messes with our depth perception.

The “Ames Room” illusion is created by slanting the back wall of the room towards the camera and the ceiling downwards.

• ### 8. These blocks seem to move one after the other, right? Wrong.

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When the black bars are removed, you’ll see that they’re always parallel. The black bar distorts your brain’s perception of movement.

• ### 9. Is the middle dancer spinning clockwise or counterclockwise?

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The answer is both. By staring at either the left or right dancer, you can change the direction the middle dancer spins.

• ### 10. If you're on a mobile, close one eye, tilt your phone and look at this image from the charger hole.

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I’m sorry. It had to be done.

• ### 11. Are these horizontal lines sloping or parallel? Look at them for a few minutes.

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They may appear to slope, but they’re parallel. Ar first, it’s hard to see the grey line between white and black tiles, meaning that the brain fills in the grey as either black or white

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• ### 13. What shape is this roof?

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• ### 15. Keep your eye on the cross and these celebrities will switch faces.

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They’re not actually switching faces. By aligning the faces at the eyes and presenting them quickly, it becomes much easier to compare them, so the differences between the faces are more extreme. If someone has a large jaw, it looks almost ogre-like.

• ### 16. Adding crosses to this checkerboard warps the straight lines.

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Try resting a finger on a line to defeat the illusion.

• ### 17. These squares are actually the same exact color.

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Hold your finger over the boundary between the two shapes and see them change. The Cornsweet illusion exploits the brain’s lateral inhibition, which creates more contrast between the two objects when they have different colored edges.

• ### 18. These cars look like they're different sizes, but in reality they're all the same.

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The Ponzo illusion works because our brain judges an object’s size based its perceived distance. The third car seems further away, so it looks much bigger.

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• ### 21. Which orange circle looks bigger? They're actually the same size.

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The Ebbinghaus illusion exploits our perception of relative size. When an object is surrounded by larger objects, it seems far smaller than it actually is.

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