Part III: Systems & Details

Unit 23: Materials & Surface Language
Unit 24: Mechanisms & Moving Parts (Depiction)
Unit 25: Ergonomics & Human Factors
Unit 26: Modular Systems & Families
Unit 27: Graphics Integration
Unit 28: States, Interactivity & Feedback
Unit 29: Scale, Measurement & Callouts
Unit 30: Wear, Weathering & Storytelling Micro‑Details