Here I want to introduce a basic formula for a double spiral Ferguson Nova:
Like for the basic Ferguson Nova there is a parameter delta because it is really a family of double spiral Ferguson Novas.
A good choice is delta = 0.1 or delta = 0.05, as you can see in the table below.
| Delta | Start Value | Double Spiral Ferguson Nova | Zoom out | Remark |
| 0.2 | -0.845494 |
|
|
a bit rough |
| 0.1 | -0.610759 |
|
|
classic double spiral Ferguson Nova |
| 0.05 | -0.471695 |
|
|
smoother and deeper into the body |
| 0.01 | -0.271936 |
|
|
the double spiral merges into the body |
| 0.005 | -0.215599 |
|
|
change of the rendering method |
| 0.001 | -0.126003 |
|
|
small deep inside |
| 0.000001 | -0.012599 |
|
|
taken to the extreme |