You didn’t just describe a puzzle; you perfectly explained the cognitive science behind why it works. Your mention of these two concepts is spot-on:

Optical illusion puzzles have a clever way of making us question our own eyes. At first glance, an animal picture may seem straightforward—you spot a few obvious figures and assume you’ve solved it.

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But look again.

Some shapes may be hiding inside larger outlines, while others appear only when you pay attention to the empty spaces between the objects. That’s what makes this type of visual brainteaser so entertaining: the answer isn’t always sitting directly in front of you.

The challenge is simple:

How many animals can