I can be found in every dimension, yet I cannot be contained. I can be both linear and circular, but I have no form. What am I?

Category: Brain · Difficulty: hard

Hint: I exist in the mind but can travel anywhere.

Answer

Concept

Explanation

Thoughts can take many shapes and forms but cannot be physically held.

This is a hard brain riddle — a tricky one that takes a little thought. The answer is Concept.

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