Try to respond with the first thought that comes to your mind.
Definition: Indigo is a color named after the blue dye derived from the plant Indigofera tinctoria and related species. The color is placed on the electromagnetic spectrum between about 420 and 450 nm in wavelength, placing it between blue and violet. Although traditionally considered one of seven colors of the rainbow or the optical spectrum, modern color scientists do not usually recognize indigo as a separate division and generally classify wavelengths shorter than about 450 nm as violet. Optical scientists Hardy and Perrin list indigo as between 446 and 464 nm wavelength.
indigo restaurant in San Francisco
Macintosh home control server
A chapter in Founding Mothers: The Women Who Raised Our Nation by Cokie Roberts
the Indigo Girls
Please post the direct URL (link) where your drawing, doodle, artwork is posted (e.g. your blog, Flickr) in the comments area of this post. I would really like to keep all the artwork together and provide a way for others to see your work and/or your blog, and how your work relates to the other responses.
The Creative Prompt Project, also, has a Flickr group, which you can join to post your responses. Are you already a member? I created that spot so those of you without blogs and websites would have a place to post your responses. Please join and look at all of the great artwork that people have posted.