in

The Klein Bottle: 3D illustration of a four dimensional mathematical object with a person side, no edges, and zero volume. Sort of like a Möbius strip with no edges. — radical

The Klein Bottle: 3D representation of a four dimensional mathematical object with one side, no edges, and zero volume. Kind of like a Möbius strip with no edges.

The Klein Bottle: 3D illustration of a four dimensional mathematical item with 1 aspect, no edges, and zero volume. Kind of like a Möbius strip with no edges. – natural