Note the price is for the hat and the scarf set. When you purchase the pattern from Knit Picks or ravelry you will get both the hat and the scarf.

This scarf features two-color brioche stitch and reversible brioche cables knit with two complimentary colors of the new Chroma Worsted Weight Yarn. The cables are completely reversible making this scarf very unique!

This pattern is worked entirely in brioche stitch so each row will be worked twice, once with the main color and once with the contrast color. 2 balls of chroma are used for the scarf as written, one in each color.

NB. There is also a pattern for a Chromatography Hat and Mittens.
http://www.ravelry.com/patterns/library/chromatography-hat
http://www.ravelry.com/patterns/library/chromatography-mi...