This object was 'found' when playing with the equation for a trefoil knot.
The equation for it is :
function f(t) =
[ sin(t) + 2 * sin(5 * t),
cos(t) - 2 * cos(5 * t),
- 2 * sin (3 * t)
It was the first object I printed at Shapeways
and indeed it has proved robust enough for the grandchildren to play. Might make a nice smal stand for something I suppose.