• chapter: Color-Change Patterns
• page: 67 (hardcover, published 1968)
• yarn: 2 colors, A & B. Optional third color C.
• technique: slip stitch

From the book:
This is a variation of the Checkered Pattern, in which the slipped stitches pull the garter stitch rows out of line upward and downward, to form hexagons. If desired, a third color can be introduced in Rows 13 through 18.