The Bezold effect is an optical illusion, where a color may appear different depending on its relation to adjacent colors.

In this subway, this guy spray painted the wall
to appear as an illusion of the stairs coming out of the wall.
Nice work.

Try staring at this for more than 5 seconds without going crazy.
Then try following it around!

Curves constantly die out and then re-evolve as part of another curve.

A visual illusion of two spheres.
Does one appear to be larger than the other?

Both of the spheres are the same size.

Look carefully at this picture, what do you see?
After you make your decision, scroll down for an explanation.

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You saw a couple in an intimate love position, right? Interestingly, research has shown that young children cannot identify the intimate couple because they do not have prior memory associated with such a scenario.
What they will see, however, is nine (small & black) dolphins in the picture!
So, I guess we've already proven you're not a young innocent child. Now, if it's hard for you to find the dolphins within 6 seconds, your mind is SO corrupted that you probably need help!
OK, here's help: look at the space between her right arm and her head, the tail is on her neck, follow it up. Look at her left hip, follow the shaded part down, it's another one, and on his shoulder..