REVOLVE is common to every 3D package I have ever explored. In every package, we get the ability to create a profile and then revolve that profile around an axis to create a 3D object. Moment of Inspiration has that feature without some of the confinements in other packages. But, it goes well beyond simply revolving circularly around a simple axis. by allowing us to select a RAIL to guide how that revolve is to be performed. This allows for more interesting and complex revolve results.
It is this kind of versatility that makes Moment of Inspiration a real joy to use.