Use your fingers or mouse to control model.
Use mouse wheel to zoom it. In the right window
use mouse wheel to animate flower (change its "age").
Drag slpine control points to control flower shape.
Procedural Lathe flowers
Revolution surfaces are used to make procedural petals.
The red subdivision spline
is generating r-curve.
The blue φ-one determines petal shape.
Nine petals are rotated and linear interpolated between two basis
petals. The second (bold) basis petal is active.
More complicated "Flower editors".
Petals (and sepals) are interpolated between 3 basis petals
by quadratic polynomials: