The eight basic forms of the universe
The eight basic forms of the universe If I can image the vertical and horizontal folds, I will make a picture.
(1) Sphere
(2) Donut
(3) Donut with horizontal folds inside
(4) Donut with horizontal folds on the outside
(5) Donut with vertical folds inside
(6) Donut with vertical folds on the outside
(7) Klein urn
(8) Klein urn with vertical fold