I sent a note to Stewart Brand and he graciously read the article. His perspective: "For me your version of civilization diagram is way too quick. I put the rate of "Culture," for example, in centuries at minimum. It is the rate at which languages and religions change in deep ways--not event by event. Not the arrival of "Hamilton." The movement from Greek drama to Italian opera. The slow parts are all about constraint and continuity." First of all, I was excited that he took the time at all to respond. And he's right. In attempting to merge the two diagrams, I quickened the speed of Pace Layers to more closely match it to Stefanies diagram. In thinking about it though, it was unnecessary. Pace Layers can keep its time scale and variations of the diagram can have different ones.