One of my elementary school classmates brought printouts of Escher's Waterfall to share. I accepted one, took it home, and taped it to my bedroom wall. My fat

One of my elementary school classmates brought printouts of Escher's Waterfall to share. I accepted one, took it home, and taped it to my bedroom wall. My father saw it and loaned me his copy of Gödel, Escher, Bach. At first, I flipped through the book looking at the Escher prints. My second time through, I read the dialogues. Next I had a go at reading the chapters and got lost. Maybe on my fifth read-through (years later) I actually attained an understanding of Gödel's Theorem (at least for a brief moment before it vanished again). I credit GEB (and its dialogues like Little Harmonic Labyrinth) for helping prepare me to deal with the kind of multi-level abstraction involved in developing a language interpreter or machine simulator. Especially that time I had to debug a crash that only occurred when running my simulator inside a simulated instance of itself (i.e. when three levels deep, but not two).