Earth and moon in $S^3$, with antipodal images visible from light wrapping around the sphere
Raymarching in S3 with earth-textured and moon-textured spheres. In S3, both objects and their antipodal images are visible, and light wrapping around the sphere creates multiple images. The compact positive-curvature geometry is the Thurston geometry that models elliptic 3-manifolds.
Controls: WASD to rotate, arrow keys to translate.
