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Brain Teasers
Our brains can do amazing things—but in the right circumstances, they can also fool us. Try the brain tricks and teasers below and find out what's going on in the brain in each one.
What makes the scrambled text in this popular example readable? Can you read it? 
How many "f"s are in this block of text? You might be surprised to find out. 
Try to count the black dots on this grid. How many do you come up with? 
Decide which monster looks larger—and find out why. 
What makes some two-dimensional circles look concave, and others convex? 
Different people see different things in this picture. How about you? 
Put on your headphones and listen to this impossible sound pattern that goes up and down simultaneously. 
How can people see 3D images hidden in a seemingly random pattern? 
Why does the brain perceive 2 identical color blocks as being totally different colors? 
How many animals can you see? And why can't you see them all at the same time?
The verbal version of the "Hidden Animals" illusions- how many words can you find?
How does motion change our perception of object size? 
Grey "grout" between the black and white tiles is the key to tricking your brain with this perplexing visual distortion. 
Which lines are longer? Take a look and see if you can get it right. 
Which of these are squares and which are parallelograms? 
