Which one doesn't belong?

Have you seen these? It's a website full of them...

Which One Doesn't Belong?

There are no answers given, because there are SO many answers!

For example, in this image, we could reason this way (but this is not the ONLY way!):


1. The shape in the upper left corner doesn't belong, because all the others have all of their sides the same length, whereas this one doesn't.

2. The shape in the upper right corner doesn't belong, because it is gray, whereas the others are white.

3. The shape in the lower left corner doesn't belong, because it is standing on its vertex, whereas the others are not.

4. The shape in the lower right corner doesn't belong, because it has five sides, whereas the others have four.



Neat thinking puzzles!
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