Layers upon layers upon layers.
I still like the basic idea here, but I couldn't make it work on multiple levels (how ironic).
I spent several hours trying to understand how color compositing works in general and in #qt in particular. I kind of got something fragile sort-of working.
When I gave up on Making It Perfect, I realized that looping a blizzard is unlikely to work.
Welp. This is a #learning #python #pyqtgraph project anyway and that goal was accomplished.