then working backwards to fill in minor numerical factors and such. This is invisible in the final result (unless elaborately faked in powerpoint) but unavoidable writing it by hand. The first half of this TED talk is very reminiscent of Dr Vigh's zoomimage and the Raskin Center demo above; then Blaise Aguera y Arcas takes it to the next level by reconstructing and navigating the Notre Dame cathedral using Flickr imagery. I saw today that the NTSB announced their suspected cause of the Big Dig tunnel collapse. I teach writing for engineers and I wanted to see if the reports of their investigation would be useful for my classes. I work at an Insurance company and I can't tell you how much I enjoyed the essay and the comments -- A cavalcade of ...what? I'm not sure what to call it. In my blog, Rhetoricia, I wrote about our PPT practices in Biting the Bullet , but it's not very serious -- and there is much to say. I'll be mining these links for some time. Thanks to Anonymous, who directed me here. In the current Communications of the ACM , Robert Gaskins essentially recommends that most people not use chartjunk. I'm not sure how this advice, retroactively applied, would have helped the NASA slides, which are very plain but highly hierarchical and confusing. Recall from my essay that opens this thread that NASA used PowerPoint as engineering documentaton for the shuttle Return to Flight project (about $2 billion). The