I've actually never been certain which thing it meant. I own some very old TVs that glow a sort of metallic gray color. Most TVs from the 70s and 80s have a sha

I've actually never been certain which thing it meant. I own some very old TVs that glow a sort of metallic gray color. Most TVs from the 70s and 80s have a sharp white-on-black snow pattern. In the 90s you got those weird solid blue screens. All seem like semi-reasonable skies, to me.