Situation: I am lying across a long couch. I am between two tables at my head and feet. I can see a monitor.
Alternative situations: I am sitting on the couch with my back close to the plant behind me and both my feet are on the couch cause I don't care. I am tired so I lay down on the couch and behind me is a table.
Question: Is the shape of a shade on a lamp in my 10 o'clock direction closer to a shpere or a cone?