our pet twig photographed last night, with the frost flower developing. There is no frost on the ground, and this is consistent with what happens in the woods (see below). It is some property of cold air on bare wood that has been in woods. I don't think the explanations that have I read so far quite hold up. It is not the woods themselves, or the cold alone.
Spot (bottom literally left) says he will lose the will to live unless we change the subject.