“Caps,” one of the tracks from the film documentary Drop City, is available as a download from CDBaby.  It appears in a scene of the film during a discussion of the technological innovation of the domes, with its savvy use of recycled bottle caps as a substitute for flathead nails when it came to applying a lining throughout the interior of the Buckminster Fuller-inspired geodesic domes.  I used the percussive sound of dropped bottle caps throughout the piece.  Here is a clip below;

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