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I understood right from the start your vision, where did you see the 4th figure. I didnt. Its a question of personal perception, right?

 16 days ago 

It is indeed a question of perception just like what we see in the clouds or not.
They say it also depends on the shape of the eyes (no idea if that's true) or which part of a picture (scenery/person) we see first (I believe that's true).

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