From the book:

Create the intricate-looking swirls in this gorgeous afghan with one simple motif. Once you make the flower centers, the rest is just single crochet and chain stitches.

The pattern specifies: Worsted-weight acrylic yarn, approximately:

• 56 oz (3165 yards / 2894 meters) burgundy
• Size I crochet hook or size to obtain gauge
• Yarn needle

Gauge: Each motif = 8.75” / 22 cm

The afghan is 61 pinwheel motifs. The pattern begins on page 22.