It would seem to me that, because the original intent of 4'33 was to allow
the natural sounds of the environment that it is "performed" in become the
performance, 4'33 would still exist in the environment in which you mention
... besides, the fact that a human ear cannot hear something does not mean
that it doesn't make a sound at an acoustic level that we are incapable of
hearing without technological modification.
"Steve Peters" <[log in to unmask]>