@screwlisp @sgharms @vnikolov the only book you cannot borrow from my collection is the one that he signed :-). But, to clarify, we only spend a couple of weekends working on some code (in Smalltalk) to see whether we could automate some of his ideas (we failed). He was a wonderful host, great company, I still remember us watching Koyaanisqatsi in the evening; and this first volume of the Nature of Order plus the rest he sent me as they got published are among my favorite books. I will get back at trying out these ideas we had, now that the computing power is there (it's my planned retirement project).