Some years ago when my 4x5 enlarger was still up in the back of my office, I tried something like this with my phone--literally just putting the phone face down

Some years ago when my 4x5 enlarger was still up in the back of my office, I tried something like this with my phone--literally just putting the phone face down in the enlarger, with a glass holder. It sort of worked. Didn't really pursue it much more than that.