This thread is great!
I'm trying to find two short stories I read when I was a kid, I guess they hail from 50's or 60's, although I read them in early 80's
The first one is a sort of fantasy-there's some kind of long war going on, and one side realised that souls (or life energies or something) of their enemies killed in the war are preserved in some kind of migratory birds so they decide to start killing the birds.
The other one is SF, in which some scinetists and engineers are trying to create a 3D TV. They create images of some very life-like dinosaurs, but when they turn the switch off, dinosaurs don't disappear...