you wouldnt expect me to be conventional would you
firstly a tuning fork running at 300hz so the a true sweep second hand

a couple of things wot rotate to as a second hand would, but dont indicate the actual time.
a rotating earth.

Vincent Calabrese's rotating NHC logo

the discus, i'm surprised this hasnt been posted earlier

and finally a rotating glass disc with a red spot on it

enjoy
Graham