"Same like any other of its kind," smiled Tim.
"But there isn't any other."
"Television is, sort of," he said. "Anyway, there is a three-way scan taking in the volume to be reproduced. Each atom in the original has its own characteristic charge and mass: this charge and mass is registered. When the reproducer replaces the real people with the image, the same scan forms real atoms where the real atom was in the original. The follow-up scan wipes the atom clear to make room for the next frame."
"How about this building atoms?" puzzled the girl. "Doesn't that make for radioactivity?"
"Uh-huh," he said, "but the radioactivity is really energy that we use to operate the machine."
The scene on the stage switched to a close-up of Martha and the picture's villain, one Jack Vanders whose leer was known across the continent.
The woman on the other side of Tim Woodart stood up and called "Cut it!" in a low contralto.