From patterns to space groups and the eigensymmetry of crystallographic orbits: a reinterpretation of some symmetry diagrams in IUCr Teaching Pamphlet No. 14

The common misinterpretation of a special orbit in centrosymmetric space groups as a general orbit in a polar subgroup is pointed out through some of the examples in IUCr Teaching Pamphlet No. 14, and an alternative interpretation is given.