The word "symphony" comes to mind.
I think the reason is that the vertical parts of the waterfall remind one a little of organ pipes, particularly as a pattern.
The apparent maelstrom in the foreground, to continue the metaphor, might be the crashing crescendo of a great orchestral piece.
A pretty abstract view of a waterfall and plunge pool I know, and maybe everyone else just sees that, but there you go.
my $0.02 worth
Tony Jay