Why is $0! = 1$?

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I know that we define $n!$ as

$$n! = n\cdot(n-1)!,$$

so that $0! = 1$ follows from $1! = 1$.

However, what I would like to find out is the mathematical intuition behind $0! = 1$, if there is any.

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How many ways are there to arrange zero objects in a line? Only one way, the way that arranges no objects.