If complex concepts are ogres 👹 then Shrek was right, ogres are like onions. They have layers.

When teaching a complex concept you can start by introducing the outermost layer of high-level explanation, then peel back a layer to explain the next level of detail, and so on until you've peeled back the entire concept.

This is something that sounds easy but as soon as you try it, you realize that there are more layers to an ogre than meets the eye.