The Geometry Poncho: lines, triangles, and squares. This Tunisian crochet poncho has front and back neck triangles worked in straight Tunisian, which are then joined and the rest of the poncho is worked in the round. The color work is achieved through stitch variation, so there are no floats to manage. As pictured, this poncho was made with three skeins of Good Karma Farm Sport yarn 60% Merino/40% Alpaca (100g/366m/400yds) in colors Blue Steel, Seawitch, and Rebel Rebel. The poncho does need 400 yards of each color. The finished shape is a square as would be created by putting two triangle shawls together and leaving part of the wingspans unjointed for a neck opening.