What analogy illustrates the conceptual difficulty of questioning what existed 'before' the universe began?

Answer

Asking what is north of the North Pole.

This analogy compares the boundary condition of $t=0$ to the North Pole, which is defined as the northernmost point, making further 'north' a nonsensical concept.

What analogy illustrates the conceptual difficulty of questioning what existed 'before' the universe began?

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