Could a creature evolve a cubic brain?

One thing that is fairly common amongst nearly every macro-scale living thing on this planet is the brain. The brain controls when creatures breathe, move, talk, etc., but the brains of said living things have one major thing in common: they are all fairly globular in shape.

Now, this got me thinking why isn't the brain formed into a different shape. To put it more definite, why doesn't the brain form into a square or a triangle?

There isn't any real world example of a different shaped brain, so I couldn't find any disadvantages or advantages to having such a differently shaped brain.

How would a creature evolve a square shaped brain? What advantages or disadvantages would arise from this brain compared to the common globular-shaped brain?

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Could a creature evolve a cubic brain?

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