An Accidental Perfect Fit

Just amblin' along on my afternoon walk, looking at this and gazing at that, when I came across this graceful curlicue on the sidewalk, composed half of a stain and half of a stalk.  Looks rather musical, like an F-clef or a sound hole on a violin.  It also reminds me of a sea horse.  Or it could be a bean sprout.  It could also be a snake or a spermatozoon, or a bunch of other things.  But always pretty.