Don't know what brought the subject of light to mind. Perhaps it is that I am trying to figure out how to properly light my sketches to be photographed. My scanner seems to have died, so until a new one arrives, I'm trying to produce useful photos of my sketches... a more difficult process than you might think. Below, a Nikon D3200 shot of today's doodle about light:
I cleaned up the above image in Photoshop, using the various selection tools to try to elimiate the brown/grey background imagine imparted by the paper in my sketch book. Below, the raw photo:
Took about an hour to completely erase that background color and texture. Had to leave it in certain of my doodled objects.
I'm enjoying my retirement, but I wish I had a part time job to pay for buying new tech stuff. That's not really in the budget.