Fair! But the fascinating thing about the TREE function is that comes from a simple game of sorts, whereas Graham’s number (for example) is built mechanistically. TREE is like evolution, Graham’s like AI. And G(1) is 3 ↑ ↑ ↑ ↑3, but TREE(1) is only 1! Amazing it overtakes it by a mile at 3. I think about that a lot.