In the mid-nineteenth century mathematicians August Ferdinand Möbius and Johann Benedict Listing found that if you take a strip of paper, give it a half twist, and attach the ends, you create an interesting object. If you follow your finger along the surface you will find that it has only one continuous surface (that is, as you follow along you will end up covering both sides of the strip. If you try to cut it in half, you only end up with a longer strip with two full twists. The mathematics describing this, and similar objects, gets quite complex. Möbius strips have found applications beyond being mathematical oddities. For instance, conveyer belts are often built as Möbius strips so that they have even wear and tear. In chemistry, Möbius aromaticity involves a ring of atoms that incorporates a half twist. Crazyjoe579 made this LEGO version.