f(z)=z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^z^zpic.twitter.com/CrGQJ1dwhF
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Plenty of ways, but only for animation purposes. The easiest most natural way I can think of is mapping one level to the next by raising it to z^t for t changing from 0 to 1. So z -> z^(z^0.1) -> z^(z^0.2) -> ... -> z^(z^0.9) -> z^z.
Sure, there are plenty; in fact, I'm pretty sure you can do it analytically as well! The thorny research questions come from trying to find ways to do this that preserve certain properties you might hope for that parallel the properties of ^, x, +...
We're not even completely sure what those properties should be!
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