I've been working again on creating different torus shapes based on the tube structures I learned from the Beaded Molecules people. Since they're based on 6-bead circles, which serve as hexagons, they lend themselves to circles, triangles, diamonds. shapes with right angles come harder. I did a post last September where I came up with several shapes. One of them, which I did in dark brownish red, was vaguely right angled, because I used 4 9-bead circles in the middle to get the curve. It didn't sit flat, though, and just generally wasn't satisfactory. I was playing around the other day and came up with a much better structure. It still uses 4 9-bead circles in the middle (they're the darker green ones) but they're arranged differently, and I like the shape much better. As a more general thing, it's a way to make a clean right angle turn in a tube structure.