Two identical glasses hide me. Fill one a centimetre higher than the other, and I appear. What am I? - Answer & Hint

Two identical glasses hide me. Fill one a centimetre higher than the other, and I appear. What am I?

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Hint: You need at least two things to notice it.

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The answer is

A difference

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A difference exists only through comparison. Two identical glasses show no difference until one level changes.

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