Origins of the multiplane camera:

One of Ub’s inventions while away from Disney was called the multiplane camera. Perfected by others leading up to Snow White, in a massive camera stand over 10 feet tall, the multiplane’s innovation was to allow a background to be split into levels. Foreground trees might be painted on the glass of the first level, then the characters sat underneath that, and then farther back layers for a building, with others behind that for hills and sky.

Manifestation in iOS 7:

It’s a return to basics. Simple things can remain simple, readable. When clarity is needed, everything goes flat. But it’s a framework that allows for subtle motion and depth without changing what works about the new, content-first flat design. iOS 7’s control center blurs the layer below. The home screen background sits deeper too, as if only the app icons are touching the screen. Photos scroll under the navigation bar.

Credit: Adam

Don’t use pure white on dark background:
The kind of text that users read is paragraph text. You should avoid using white text on a dark background when displaying paragraph text to make it easier from them to read. Forcing users to fixate on the white text for a long time can strain the user’s eyes. This is because white stimulates all three types of color sensitive visual receptors in the human eye in nearly equal amounts [source]. This makes reading white paragraph text on dark backgrounds stressful on the user’s eyes.