The spherical tetrahedron BBCC

This tetrahedron occurs in two non-congruent mirror-image forms. In the conformal image on the left, it is shown with vertices 1,i,a,c; on the right, with 1,i,a,d; all five vertices are colored violet in each picture. In both pictures, the vertex 1 is at the center, and the yellow-brown sphere is the equator between 1 and -1. The vertex i lies on this sphere. Note that the group element -b^2 lies midway along the edge from i to a.

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