In this pattern you always knit with one yarn and purl with the other. Due to the nature of knits and purls, whenever the two stitches are striped, the purl bumps jump out, while the knits seem to hide. It's so simple to create, and using Noro yarn, which has stunning shifting color ways, accentuates these stitch patterns.
Don't forget to add size 8 16" circular needles!