Ralph Griswold's web document describes two ways of extending a small interlacement motif into a larger weaving pattern: the replication schema, which repeats the motif, and the inversion schema, which juxtaposes a motif with its inverse (face and back) and iterates, doubling the size each time. It covers the properties of inversion patterns, including the Morse-Thue Carpet, non-periodicity, self-similarity, and constant loom requirements. It also covers how switching from inversion to repetition using the upper-left three-quarters of an iteration compares with combination weaves and checkerboard patterns. An appendix of many pages of black-and-white drawdown-style grids shows the development of inversion patterns from several foundation motifs.