A two-page swatch page from the Minnesota Weaver explaining crackle weave as a 4-block, 3-harness point twill structure. It covers transition threads, which blocks weave together, a profile draft and a 4-shaft threading and tie-up for jack and counterbalance looms. Two sample grids are included, one with block treadling and tabby and one with random treadling, along with materials (10/2 cotton warp, Rya wool pattern weft), sett, uses, notes and a short bibliography.