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#8. Test your Brain with these 10 Visual Illusions

The brain has two hemispheres, each divided into four lobes. Each lobe is responsible for different functions. For instance the frontal cortex (in blue below) is responsible for decision making and planning; the temporal lobe (in green) for language and memory; and the parietal lobe (in yellow) for spatial skills. The occipital lobe (in red) is entirely devoted to vision: It is thus the place where visual illusions happen.

top 10 visual illusions

The frontal lobe represents around 41% of total cerebral cortex volume; the temporal lobe 22%; the parietal lobe 19%; and the occipital lobe 18%. How the visual system processes shapes, colors, sizes, etc. has been researched for decades. One way to understand more about this system is to look at how we can trick it, that is, to look at how the brain reacts to visual illusions.


10 visual illusions to combine fun and learning about the visual system (You’ll find answers and explanations at the end of the article)

We know you know there is a trick since these are illusions… but don’t try to be smarter than your brain: Just enjoyed being tricked!

1. Are the squares inside the blue and yellow squares all the same color?

square color illusion test


2. Are the horizontal lines straight or crooked?

café wall optical illusion


3. Are the circles static or moving?

circle motion illusion test


4. How many legs does this elephant have?

elephant visual illusion test


5. Can you put the fish in the fishbowl?

Stare at the yellow stripe in the middle of the fish in the picture below for about 10-20 sec. Then move your gaze to the fish bowl.

fish bowl illusions test


Keep reading to try the next 5 illusions

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7 Responses

  1. Steven says:

    Most of these are old, but some I haven’t seen before. I absolutely love optical illusions.

  2. T.L. says:

    Awesome! I like being tricked even when I know its happening. Too cool.

  3. Geroboam says:

    Old salsa.

  4. Lenny says:

    These are pretty neat!!! I am always so fascinated by optical illusions!!

  5. T. H. says:


  6. Pascale says:

    Hi T.H., There is nothing special to be seen in Escher’s drawing. It is a great example of an impossible object, just for your eyes’ pleasure!

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