Pattern available as part of a kit sold by Herrschners. From their website:

Individual pattern can be purchased here.

Basic stitches, and contrasting use of color combine to create blocks of optical illusion. Intermediate crochet kit includes Herrschners® Worsted 8 yarn, clear vinyl storage bag, yarn needle, a label for personalization, and 2014 Award Winning Crochet Afghans book with three additional patterns. Approximately 53 x 53” (135 x 135cm). Imported. Designed by Rosanna Huffman of Dayton, OH.