Grünbaum–Rigby configuration

The Grünbaum–Rigby configuration is a specific arrangement of points and lines in projective geometry. It consists of 10 points and 10 lines, with particular properties regarding their incidence. The configuration can be visualized as follows: 1. There are 10 points, typically labeled A, B, C, ..., J. 2. There are 10 lines, which can also be labeled. 3. Each point lies on exactly 3 lines.