I am thinking that it's a loop of matter containing one square planck length. The matter would have to exist in the planck length areas surrounding the center. So would you have something like a tic-tac-toe board of planck area "squares" with the center being empty and the other squares filled with matter? What's the minimum number of planck areas that can surround another one? Not sure I'm expressing this correctly and I'm an amateur so go lightly on me. On a related note, do you think the planck areas are actual "cells", and can those cells move relative to one another or are they fixed?