For example, a floating windows user could monitor a stock ticker in a background window while working on a report in the foreground.

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Rather than close or minimize a phone window to interact with a background application like a music player, users could control a primary application, like email, via touchscreen or keys, and manage the background application via gestures, said Goren.

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Just above the dial center is a small rectangular window, about the same shade as the background, which turns gradually red as evening falls.

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The couple sat in silhouette, framed by a large picture window, while the setting sun turned the background shades of yellow, orange, magenta and deep purple.

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His office window was open and a Blue Jay was calling in the background.

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