To make a Zig Zag quilt. There are lots of tutorials on the internet, but I chose to go my own way and used quarter-square triangles. 6" finished, so 10 across would make 60" and 13 down would make 78". Perfect. Until I cut them all out, checked for color on the design wall and realized they are 3" tall. So back to the cutting table I'll go to cut 13 more rows.