What an odd thing to say! The Lisp implementation page has no explanation that I could find of either how to build the tree or how to search it. Or did you mean you found the source code to be a clearer explanation?
Edit: The lisp page does have a nice picture of a tree. Did you mean that looking at that picture you could figure out both the algorithm for building the tree and for querying it and the proof that these are correct faster than by reading Nick's blog post?
I meant that the picture explains the tree's structure much clearer than the blog post, which is probably not surprising. Didn't really look at how to build or query the tree.
Edit: The lisp page does have a nice picture of a tree. Did you mean that looking at that picture you could figure out both the algorithm for building the tree and for querying it and the proof that these are correct faster than by reading Nick's blog post?