One of Jack Coleman's posts mentions something called SDRAW, which he said was helping him visualize cons structures. I hadn't heard of it before, but googling turned up a copy of the SDRAW code available from David Touretzky.
? (sdraw '((a b)(c d))) [*|*]------------------>[*|*]--->NIL | | v v [*|*]--->[*|*]--->NIL [*|*]--->[*|*]--->NIL | | | | v v v v A B C D
(This example is from a document by Lee Spector on Lisp internals.)Posted by jjwiseman at April 27, 2004 09:11 AM