Hessian configuration

The Hessian configuration is a  (94,123) with 9 points, 3 on a line, and 12 lines, 4 through each point. A model of this configuration can be found in the Hessian polyhedron 3{3}3{3}3. The POINTs are the nine diameters of the polyhedron:

complex_polyhedron_3-3-3-3-3_2diameter1

complex_polyhedron_3-3-3-3-3_2diameter3complex_polyhedron_3-3-3-3-3_2diameter2

and the rotated versions of these three. The LINEs are the polygons 3{4}2:

complex_polyhedron_3-3-3-3-3_2342_1

complex_polyhedron_3-3-3-3-3_2342_3

complex_polyhedron_3-3-3-3-3_2342_4bcomplex_polyhedron_3-3-3-3-3_2342_2

and rotated versions of these four.

To verify that the configuration is a  (94,123), observe that the first POINT is incident with the first three LINEs and with this fourth:

complex_polyhedron_3-3-3-3-3_2342_3b

It is easy to see that each LINE has 3 triangular POINTs.

see also the Wikipedia page:

https://en.wikipedia.org/wiki/Hessian_polyhedron