What's the standing wave of a photon, of a string, of all the particles standing in?
In a musical instrument, the standing wave nodes are fixed at the extremes of the instrument. So those standing waves are standing in the instrument itself.
What's the instrument for a photon?
Or in string theory we read that the tips of the string snippets are somehow attached to space itself. But the loop strings are free to come and go into and out of our universe (Lisa Randall). At least these are standing in themselves as loops. But those snippets? What are they standing in.