Everything in Womp is created with primitives. By gooping them together or subtracting them from each other, you are able to create far more complex shapes than the simple spheres, cylinders or cubes that you start out with.
Please note that if you want primitives to interact with each other, they need to be in the same area.
https://www.youtube.com/watch?v=SYzo1eun664
In this lesson: