Optical illusion

This is an optical illusion.

instructions:

1. look at the black plus in the center...


2. don't move your eyes or blink.


3. after 5-10 seconds you see a green dot - but there isn't one.


4. after 10-20 seconds the dots will be invisible...

Thanks for watching.

I appreciate your comments.

_{Inspired by Prof. Dr. Dr. Manfred Spitzer}


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