Very loosely related to bicycling**, but does anyone remember when a rainbow banner/rainbow flag was a symbol of the hippie movement? Seems its been re-used (or co-opt'd) by the racial equality folks in the 1980s-1990s-2000s, then the LGTBQ(?) crowd in the 2000-2010 era.
** - I saw a rainbow-shaped rainbow sticker on the rear window of a 1960s-era VW bug while out on a ride early this morning.