@Richiegageglass has become well known for his prototype work incorporating scientific design into the heady art world. These caps are a perfect example of the collision of both worlds. The Klein design is by definition;
In topology, a branch of mathematics, the Klein bottle() is an example of a non-orientable surface; it is a two-dimensional manifold against which a system for determining a normal vector cannot be consistently defined. Informally, it is a one-sided surface which, if traveled upon, could be followed back to the point of origin while flipping the traveler upside down. Other related non-orientable objects include the Möbius strip and the real projective plane. While a Möbius strip is a surface with boundary, a Klein bottle has no boundary. For comparison, a sphere is an orientable surface with no boundary.