It is a 3d representation of a 4d object that is basically the equivalent of a 4d mobius strip. There is only one side, no edges, and in 4d it doesn't bisect it

It is a 3d representation of a 4d object that is basically the equivalent of a 4d mobius strip. There is only one side, no edges, and in 4d it doesn't bisect itself. You could store a liquid in it, but it is impractical to clean or drink from. Mostly mathematicians would be interested in it, as a novelty.