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Paul Saffo, the article introduces the installation with:
"Can a map be a mile long? Kevin Kelly (founding editor of Wired Magazine) and David Rumsey created one with The Speed of The Earth art installation, a roughly one mile long line of 30 strobe lights mapping the rotational speed of the earth on its axis"

Paul, since you know my "long now" connection to "Long Now", you will be amused at something I discovered this year... I get junk mail addressed to Kevin Kelly. :) I would imagine this came about thanks to some early A.I. iteration of an app designed to harvest the names of key people for online businesses. My website for my historical atlas includes a review from years ago written by Kevin Kelly (yes, the same "founding editor of Wired magazine" who was co-creator of this speed of rotation art installation). My little website also includes my business mailing address (identical to my apartment). So some app apparently put two and two together and got ten. This app and the bulk mail customers signed up to it are sending postal mail addressed to Kevin Kelly to my business/home address. :)

Frank Reed