Dimples or Bumps?

This exercise simply asks you to look at this image.

What do you see – 3 smaller dimples or bumps?
What do you see – 1 larger dimple or bump?

(A dimple appears to recede into the surface; a bump appears to protrude out of the surface.)

Dimple or Bump 1

After you’ve determined how many dimples and how many bumps you see, scroll down and look at the same image from a different perspective.
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Now how many dimples and how many bumps do you see?

Dimple or Bump 1

Now … what might this suggest about two different people observing the ‘same’ event from their own individual/different perspectives?