Actions are the new "Commands" in Curvy. A lot of the new 4.0 features work best if you can live-edit the input curves and meshes while watching the results update. This is perfect for curve-bends and deforms, but also handy for simpler operations like rotations and skews.
Being able to fine tune parameters and source objects and curves is very useful - saving lots of trial and error.
Some Actions can be left 'Live' permanently... for example an Array that makes lots of copies of an object over a surface can leave all those copies as Instances, letting you update the source object to update the instances automatically.
![Image](https://media.giphy.com/media/9NLI3tHr2ObLz2A6Vv/giphy.gif)
We've seen Proxies briefly before in Curvy - and this is a whole lot more complex - but with so many new tools and features enabled by this new method I hope to get it working well for 4.0.