Not much to explain. Its basically a mobius like structure.
Try to imagine a piece of rubber, a bit like a pole, but instead of being a round cylinder it were a four sided "rod".. since its rubber its flexible.. now take the two end and connect them together creating a ring. If you make sure when you do this you have a 1/4 turn on one end you would wind up with a structure like what you see in the imagine.
@freemo @TauAs Dare to explain?