Odd Man Out

Here's a fun brain teaser courtesy of Tanya Khovanova’s Math Blog:

Which shape below is the odd man out?

Comments

[Clare]

square without the stroke - that's a photoshop geek would say anyway.

[Shelly K]

I would say the neon-green square. Am I wrong?

[guyE]

first red square with frame on the left is odd - there's nothing odd about it
the other ones are either small,green,round or frameless

[GabiB]

First red square - it has always one more attribute in common with the shape you're comparing to than the rest of the shapes.

[Lawrence D'Oliveiro]

The question did say “shape”, therefore it must be the circle.

[DaveM]

Gotta say the first one. It has only one property different from all the others. The first one is the hub of the "similarity graph".

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[Aaron]

I would say the neon-green square. Am I wrong?

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[Nath]

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