“Notice that that's kind of bouncy sideways, too. You can't have anything that is stiff in one direction and soft in another, unless you have a big framework to fake it inside or more parts involved.

“Sorry, I'm getting ahead of myself. Pay attention to what you did to make the two disks stay apart. You can make it rigid instead of springy. There's a connection between every part of one disk and every part of the other; take those connections and find the way they're a gentle change, and make them sharp instead.”