About a book I started to read a bit more than a year ago, but did not understand beyond its incredible introduction. This is the page of the author of that book, and here is a great guide to it. I am now reading again and the main problem in understanding seems to be that it is of such clarity that often it seems as if you see right through it; then it seems as if there is nothing there. But the introduction, the notes and the guiding book are more redundant, so that helps. There is also a wikipedia entry about it, where they mention terms like ‘boundary mathematics’, ‘mereology’ and ‘mereotopology’ that need checking out some other time. At the moment I would choose ‘Laws of Form’ if I would be allowed to keep only one book.