The answers to this question have led me to wonder: if you string a guitar with a differently-shaped string, would it have interestingly different sonic properties? And of course, since I can't just imagine what it sounds like, I start to put every bit of magic from behind the rainbow just on the other side of the mystery.
So are there such things as ...
Ribbon strings (flattened) ?
Tube strings (no core) ?
Hexagonal strings (like using just the hex core from a wrapped string) ?
Higher n-gons ?
Wound with one of these ?
So am I on to something, or am I on something?