Do we always see things as they are?

Have a look at this optical illusion. If your eyes follow the movement of the rotating pink dot, the dots will remain only one color, pink.

However if you stare at the black ‘+’ in the centre, the moving dot turns to green.

Now, concentrate on the black  ‘+’ in the centre of the picture. After a short period, all the pink dots will slowly disappear, and you will only see only a single green dot rotating.

It’s amazing how our brain works. There really is no green dot, and the pink ones really don’t disappear. The implication of this is that our brain actively interprets the sensory data that it receives.

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