Here is a node which has the first nested ellipse rotating and scaling inside a stationary ellipse.

The node program is very hard to grasp. Changes do not do the expected. Quartz does not reset well.
There should be a master reset.
Starting at 90 degrees was not accomplished.
Rotating the stationary ellipse was not accomplished.
A second nesting ellipse was not accomplished.

- Brian

Ps, Adjusted tilt angle needs to feed into c input. ?