Anyone ever tried this?

Incredibly impractical, but I was messing around with a manual focus lens on my DSLR, had the thought of changing focus mid-shot, like shutter drag. Produced this image, which has an interesting glow on the edges that were in focus. Think it could be a fun idea, but (at least for me) it required a tripod and a long shutter speed. Curious, has anyone ever tried this? Is there a conventional name for it?