A few projective planes I once made. Jacques Siboni (click on image to zoom)
CrossCap 1
R. S. I. on a Cross Cap: Real is in red, Symbolic in purple, Imaginary in green
Point Singularity
Projective Plane with a point singularity
Soap Bubble
Projective Plan with a point singularity made with soap bubble
CrossCap 2
Cross Cap
CrossCap 3
Cross Cap
CrossCap 4
Cross Cap
CrossCap 5
Cross Cap
CrossCap 6
Cross Cap