one of the first illustrations of the rocking motion
can be found in a current symbol in alchemy:
the rebis - the 're-born' or hermaphrodite - is
standing on a half-moon.
(the king and queen, the two are one.
the rebis is cursed to forever roam the shores of the lake,
but is known to have knowledge of things well beyond its
domain. alchemy is the 'maternal darkness' and compensates
for christianity's 'paternal light' and the goal is to
become holy oneself, light and dark made one).
