A klein bottle is an example of a non-orientable surface: it is impossible to mathematically assign an inside or an outside to the shape.  This non-euclidean geometry is a higher dimensional version of a more commonly known "mobius strip", and shows a representation of how the third dimension may warp through a fourth to endlessly cycle.  More information about it can be found at [ Klein bottle - Wikipedia ].
 
This model features a typical klein bottle shape with a small "exosphere" design inside.  the "exosphere" is a shape consisting of an orb within an orb, with donut holes penetrated through them.   This model has a refined style of foot with a small platform and an opal embedded in the post that the klein sits on.