Spin spiral models

Upon reading [a research paper](http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.98.110406) about spin spirals being generated by dipole-dipole interactions within a spinor Bose-Einstein condensate I thought it would be cool to design a physical object to represent the resulting spin spiral.

These objects represent the transverse spin rotation angle with distance along the quantisation axis of a 1D spinor Bose-Einstein condensate with dipole-dipole interactions, as shown in figure 1 of the paper linked above. There is a separate spin spiral for different evolution times where the spiral gets more twisty for longer evolution times.

The included models are 10cm tall, but there is also a customisable version where the height, width and thickness of the spiral can be varied.