Measure out a piece of the roping that is four times the length of the patio chair side seat support rail.
Hold the measured piece of roping parallel to the support rail at the front corner of the rail. Guide the spool of roping around the opposite support chair support rail, and then bring the spool of rope back to the starting point.
Tie a square knot with the long, free end of the rope and the spooled rope. Make a square knot by passing the free end of rope under the spooled rope. Tighten and pass the spooled rope under the free rope.
Repeat steps 2 and 3, creating a neat series of square macramé knots along one edge of the chair seat frame and keeping the rope lengths as close to each other as possible. Cut and knot the end of the rope.
Repeat steps 1 through 4 to macramé the patio chair back.