Fig. shows a triangular region of a 2D configuration space with different regions coloured by contiguous generic symmetry. The region in green is composed of configurations all exhibiting one generic symmetry point group (denoted PG1) and is bounded on its sides by 1D regions (red), each featuring generic symmetries (denoted PG2a, PG2b, and PG2c). Point groups PG2a, PG2b, and PG2c may be distinct or identical but they all differ to PG1. The ends of the 1D red regions are bounded by 0D points (blue) which also complete the boundary of the 2D green region. The symmetries of these points are denoted PG3a, PG3b, and PG3c. Again, point groups PG3a, PG3b, and PG3c may be distinct or identical but all differ to PG1, PG2a, PG2b, and PG2c.