People running Mac OS 10.3 or higher should try the following little trick:
Hold down Control+Alt+Apple+8 (or asterix on the number pad, if you have a full keyboard).
This will reset your monitor to grayscale and invert it. This might be useful in a room where you want to use your computer unobtrusively. Otherwise, it might just be an opportunity to show off your OS X prowess to awe-stricken masses of onlookers.
Author: Milan
In the spring of 2005, I graduated from the University of British Columbia with a degree in International Relations and a general focus in the area of environmental politics. Between 2005 and 2007 I completed an M.Phil in IR at Wadham College, Oxford. I worked for five years for the Canadian federal government, including completing the Accelerated Economist Training Program, and then completed a PhD in Political Science at the University of Toronto in 2023.
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Whoa.
I should take a screenshot. The colors on my display are inverted, but decidedly not grayscale.
You can do this through the Universal Access settings, also.