Force Mac to display in grayscale Is there a way to force OSX to display in monochrome(also known as grayscale)?

I'm working with a student who has ADHD (and I am mildly ADHD myself).  The colors are too much for him/her to handle.

EDIT: Ideally I'm looking to assign a keyboard shortcut or create a desktop icon.
Yes, this can be achieved with AppleScript and Automator.

The setting to automate is located in:

System Preferences > Accessibility > Display > Use Greyscale

The keyboard combination option + command + F5 also shows Accessibility options.

This Apple discussion, Keyboard shortcut for "Use grayscale", shows how to use AppleScript and Automator to create a menu bar item that toggles the Greyscale on/off.