Recursion

A process is recursive when it defines or contains itself; e.g., the Fibonacci sequence, which determines the next number as the sum of the previous two.

But not all recursive processes are mathematical. Recursion can happen in a temporal context when, for instance, the powerful magical force that is true love drags you back in time so it can create itself, endangering the fate of the Wizarding World—not to mention the very fabric of space and time—along the way.