It's actually the front of Stereographic projection maze. If you use it to project, it's not as accurate as Stereographic projection maze. The reason is this prototype just connects two points to form a line with some modifications of the line thickness. Besides, the generated model of this prototype looks weird if you specify a small maze size, such as the stereographic_maze2_5x5.stl.

This is, however, a simple way to demonstrate how to implement stereographic projection.

Even though a more accurate Stereographic projection maze grew out of this, I still published it. That's because my daughter said the generated model itself has a special style and i have the same feeling, too.

Find my things about stereographic projection in stereographic_projection.

• OpenSCAD Documentation - Traditional Chinese
• OpenSCAD Documentation - English