The first color wheel (a.k.a. color circle) has been traced back to Sir Isaac Newton, who in 1706 arranged red, orange, yellow, green, blue, indigo, and violet into a natural progression on a rotating disk. As the disk spins, the colors blur together so rapidly that the human eye sees white. Artists have been experimenting with colour wheels ever since, finding inspiration in everything from cocktail umbrellas, river rocks, autumn leaves, pencil shavings, to juggling.
The Happy Hour color wheel consists of exotic cocktail umbrellas. It was created by Bright Lights Little City:
The Rocks color wheel is a collection of stones from Salmon River, Idaho. It was assembled by Purl Bee:
This Yarn Skeinlet color wheel features dyes made of cochineal (ground up cactus-eating scale insects), osage orange, chamomile, indigo and logwood. It was created by Sarah of the Blue Garter blog:
The Circle of Life color wheel was created by Thalandor as a tribute to the artist Mother Nature:
This Kusudama (Medicine Ball) color wheel was created by Origami artist Vanessa Gould:
The Pencil Shavings color wheel was photographed by Myruby:
And a full pencil color wheel was taken by ERK_
This Garden Blossom color wheel is the work of Tiny Haus:
The Juggler color wheel was painted by Kenneth Callicutt:
The Chalk color wheel was photographed near Parc De La Villette, Paris, by Jacobz:
Another chalk color wheel was spotted in Paris by seanhabig:
Cover 
by Claire L. Evans.
About the Guest Author, Craig Conley
Website: http://www.OneLetterWords.com
Craig is an independent scholar and author of dozens of strange and unusual books, including a unicorn field guide and a dictionary of magic words. He also loves color: Prof. Oddfellow
