The model

What the runtime is, stated once and precisely. Views, scopes, overlays, the audio relation, deltas, the one place visibility and audibility touch, and what a turn costs.

No types and no code appear in this chapter. It defines the vocabulary the rest of the book uses, and it can be read without any intention of writing an application.

Reading it in order is worth the trouble. Each definition is built from the ones before it, starting at Vocabulary.

Readers who would rather see the thing run first should start at Running the arena and come back.