(define Ω (let ([w (lambda (f) (f f))]) (w w)))

Hey! I love this. I'll come back when I have more time to go through the site and comment, but I think it's aesthetically very pleasing, and I love both the tree-metaphor and the garden-metaphor. I think the tree-metaphor is similar to how memory works in the brain, and I think the garden-metaphor is just lovely and compelling.