Xah Lee wrote: > The one most prominent mention of it is in chapter 2 of the book > Structure and Interpretation of Computer Programs by Hal Abelson et al.
Thanks for the interesting book tip, it is available online: http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-15.html#%_sec_2.2.4 > anyway, today i ran into this page by Frank Buß > http://www.frank-buss.de/lisp/functional.html > which used the idea in the book to render a traditional Escher's tiling > piece. I should note that I've used the original paper from Peter Henderson, which is cited in the book, too: http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-15.html#footnote_Temp_202 -- Frank Buss, [EMAIL PROTECTED] http://www.frank-buss.de, http://www.it4-systems.de -- http://mail.python.org/mailman/listinfo/python-list