Optical scientists cleverly named the visible mix rendered by the colors in light the Color Rendering Index.

FORBES: The LED Illumination Revolution

Its report grades cities using, in part, the EPA's color-coded Air Quality Index, as well as its own weighting system that ranks the severity of pollution on a daily basis.

FORBES: Life

With a virtual 6 x 9 inch color VGA display, a small joy stick and mouse buttons operable by the index finger when using the phone during a conversation the StarTac phone provided the ability to viewed shared subject matter, photos or documents while talking, 15 years ago.

FORBES: The Cyber Display Telephone

They broke the book down into hundreds of scenes, copied them onto colored index cards, and spread the cards on the floor, with each color representing a different character or time period.

NEWYORKER: Beyond the Matrix

Kaufman's book is a marvel of concision, with a handy color-coding system (red for "medium-size land birds") and a one-page index on the back page.

FORBES: Peterson's Progeny