This is an image of the floor in front of the checkout counter at a deli in Rockville, Maryland. Standing and awaiting completion of their purchases, customers have worn away the floor tiles with their shuffling feet, revealing contours of their use. The central brown area shows the concentrated region of the most wear. So frequently has this central spot served customers that the tile has been worn through to its interior, well deeper than its decorative surface. Around that, lesser use has worn off only the pattern of the floor tile. This leaves a white annulus of wear surrounding the central region. Beyond this there is a dirtier area of the floor tile where customers queue up to pay for their purchases. This all results in an image of the somewhat circular contours of the joint frequency distribution of customer foot placement at the checkout counter.
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