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I think it's absolutely hideous. Turned it back to normal after two seconds - far too awful to keep for longer.
 
Screen invert is sometimes used when reading in low light (more often just something neat to show people; see also: accessibility zoom) and this feature has been around on OS X for... a long time.
 
wow! Cool feature.

Definitely not pretty, but I could see myself using this when writing a paper. It's easier on the eyes and I'd be less likely to get distracted.

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