I wanted to be able to combine different transformations in different ways, but I didn't want to get lost while tracing lines (like here, for example) - the usual way of putting nodes everywhere and linking them together did not sound good for me.
Instead, I decided to place things on screen in the order of computation:
- transformations are applied from top to bottom
- transformations on the same level are either all applied at the same time - like with Sum here, or only one of them is applied - like in Choice back there (that's how it looked like 3 years ago

What you see above is a slightly non-trivial "final transformation" for a hyperbolic tiling I made a few months ago.
I certainly find it much easier to work with this, than to manage "xaos links" in Apophysis.
Besides, as I have already said some time before - everything is a transformation. Including the "Sum" - which is a transformation that contains other transformations. This means that it is possible to put anything - not only a simple transformation, but a random choice (also contains other transformations), or another sum inside it.
And finally, here's a low-ish quality render, just to demonstrate the result:

Just in case somebody tries to reproduce this in Apo








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