My cat sat on my keyboard and now my desktop display looks like it is in night vision with color. How do I get it back to it's original display?

My cat sat on my keyboard and changed the display. Now the coloration and brightness looks like it is in night vision with a bit of color. It is similar to one of the photo booth effect options. How do I get it back to normal?

Hi JoeBeth,
Welcome to the Apple Support Communities!
It sounds like your colors have become inverted on your display. This is a feature of Universal Access. Please refer to the attached article for information on this feature with instructions to toggle it on and off. 
Mac OS X displays inverted image colors (white on black, reverse type)
Have a great day,
Joe

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