Hello! I'm just wondering why frost curls? I always thought it was always linear, but I noticed the frost on our very VERY old windows in my one twin's bedroom was curling around the frame, and the monogram decoration leaning up against it, and wondered if it has to do with the fact that both of those things are metal? It reminds me of a Solar Flare being pulled into the Sun's magnetic field when you look through a solar telescope. The first three photos are in one twin's room, the last photo is a close up of a curl near the metal frame in the other twin's room. :)