This script is called BowTie.
_FxGraph3D v*sin(u);v*cos(u);a * asin(((exp(u*sin(v)) - exp(-u*sin(v)))/2) * ((exp(u*cos(v)) + exp(-u*cos(v)))/2));-0.8;0.8;-3.14159;3.14159;15;15;1;;;UV

Selecting just the U iso curves, allows trim with a point at the origin.
Each bow will then network at the 15 curve density.
Each surface can be extruded slightly and the fillet applied.

- Brian