Because, math.
Imagine a function, g(Taco), which takes a Taco as input and returns a Taco with the same properties, but with an added layer of recursion.
Let's say g(Taco) = Taco + g(Taco). This means that every time we apply g(Taco), we get a new Taco that's one layer deeper than the last.
But, wait, there's more! We can apply g(Taco) to the result, and to the result of that, and to the result of that... g(g(Taco)), g(g(g(Taco))), g(g(g(Taco))), ad infinitum...
So, what does this mean for our poor, unsuspecting Taco Tuesday? It means that every Taco Tuesday, no matter how simple or complex, is actually a self-contained universe of recursive Tacos, waiting to be unfolded.
But, be warned: the more we apply g(Taco), the more we lose track of what we're eating. It's a culinary rabbit hole of infinite depth, where each bite leads to another, and another, and... another.