First lesson in a Posselt's Textile Journal correspondence course on designing and fabric structure for harness work. It classifies woven fabrics into regular, pile and gauze/leno structures, then explains point paper (squared design paper), how warp and filling are represented on it, and the convention of marking warp-up squares. It also covers common point paper sizes such as 8x8, choice and trimming of brush, vermilion paint, and ends with five review questions for students.