How to Invert Colors on a Mac

Click on the Macintosh's 'System Preferences' icon, it looks like an apple on a light switch.
Locate the row labeled 'System.' Click on the last icon named 'Universal Access.'
Wait until the 'Display' screen appears. Press the 'White on Black' button.
Enjoy the altered look. Once the 'new look' gets old, return the screen to the old display by following Steps 1 through 4 again, making sure to click on 'Black on White.'
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