Narrator: Fireworks have been around for millennia. They flood the sky with brilliant bursts of scarlet, emerald, and ivory. But never blue. Pyrotechnicians have tried to produce blue fireworks ...

and soar up toward the bright blue sky, she shares. “Brighter blues can help you get motivated and moving,” she adds. Got a case of the blues? There’s a reason that we call it that ...

hence the blue sky reference in the name of the era, as these shows would feature bold colors, optimism, hope, comedy with drama, and a bright, blue sky you'd never see in, say, Oz or The Wire.

But think of dark clouds behind which the sun is hidden. As a cloud comes out from behind the dark clouds into a bright blue sky, it is edged with a silvery lining. Thus we are moving from ...