The 46 patterns used by H.J. Woods to illustrate his original classification of
46 types of two-color symmetries of repeating patterns, as appeared in his 1936 work "The geometrical basis of pattern design.
Part IV - Counterchange symmetry in plane patterns" (Journal of the Textile Institute, Transactions, v. 27, pp. T305-320). See two-color symmetries
Patterns with 46 counterchange symmetries from H.J. Woods re-created
with Artlandia SymmetryWorks.