Additional materials:
-22in (55cm) concealed zip

Description from the book:
Mathematics was never my strong point at school, but I did used to enjoy geometry--the study of lines and angles. A neat, precisely tessellating pattern of triangular shapes knitted in reverse and plain stockinette (stocking) stitch cover the front and back of this rather unusually shaped cushion cover. The side panels are knitted in reverse or plain stockinette (stocking) stitch and are sewn together to create a pill-box shape.

A chart is included for both the front and side panels.