“Here is a draft of what might well be the 4 concluding pages to the chapter in ‘Beautiful Evidence’ on causal arrows and linking lines. A few other parts of the chapter were posted earlier (on the Barr art chart, on evolutionary trees and cladistic diagrams). After this new material is reviewed by Kindly Contributors, then perhaps the full 16-page chapter will at last be ready to post.” (Edward Tufte) – courtesy of xblog