Today the main thing I am thinking about is dots. I was thinking about easy ways to make a dot change appearance, if you could do that then you have created a pixel and with a grid of pixels you can create a screen, this is the ultimate hobby. Sitting in a workshop/room in your home trying to make a screen, for an ordinary man that would be like a small country sending a man into space without assistance from other nations, super difficult.
There are the obvious ways like using liquid crystal solution to change opacity when a current goes through it. Or just have a grid of L.E.D. Lights.
Perhaps there is a non conventional way like making a real dot float or sink. This sort of thing helps you get through a lot of dull repetitive work. If my eyes are glassed over slightly the next few days then at least you will know what is on my mind.
