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Check out Jim Walker's slide show with audio on the TAB blog. (I've linked to the blog page, not directly to the slide show. On the blog page, you'll have to click another link to start the show.) Jim took hundreds of pictures from a fixed location across the street from two volunteers doing "visibility" for Move Newton Forward and Newton for Fiscal Responsibility and interviewed the volunteers. It's a nice bit of work on its own terms, but I loved it for its unintended peek into the dynamics of the street.

Put in simpler language: I couldn't believe the number of bikers who pedaled through the frame.