via cult of mac“Here’s a fun one. Whatever you’re doing on your Mac, from any application or any document, try hitting all these buttons together: Control+Option+Command+8. Bam! Your screen colors are inverted. Don’t worry, you haven’t broken anything, and this isn’t a bug. It’s a feature. To switch things back, hit the same key combination again: Control+Option+Command+8. The same command toggles this feature on and off. The inverted colors feature is one of the accessibility tools that are built into OS X (to see more of them, go to System Preferences and click on Universal Access).”
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