Source: The Five Hat Racks - (A Motion Graphics from The Universial Principles of Design) - YouTube
putting a little swing into dry old classification theory.
Design Hacks for the Pragmatic Minded — Warpspire
Timothy Prestero: Design for people, not awards | Video on TED.com
Play This Thing!
Gamasutra: Ben Lewis-Evans's Blog - Dopamine and games – Liking, learning, or wanting to play?