Looks good Philo.

Please correct me if I am wrong:

The red, orange, and blue curves began life as "smooth" iso-curves of the cushion.
They are concentric, due to the revolve rail used to create the cushion.
( The red curve began as the green curve, to which z distortions was done. )
The parent curve of the orange curve had xy distortion applied to it.
Similarly for the blue curve. Wonder why the blue curve appears to be a scaled down version of the orange curve?

- Brian