[r-t] Cayley graphs of doubles extents

[Stephen Penney]

> http://www.math.ubc.ca/~holroyd/cayley/
>
> Follow the link above for interactive pictures of Cayley graphs of the
> extent of doubles.  Drag the mouse over the image to rotate it (Java
> required).

Magic.
Now how do we convince people on ringing chat that the best way to learn
methods is to memorise routes through 3-dimensional space?

Percy