Interaction-Design.org is doing an amazing job of developing a textbook for Human-Computer Interaction (HCI) Design. This newest chapter, Visual Aesthetics in human-computer interaction and interaction design by Noam Tractinsky works to tease out the aspects of design that make products appealing, memorable, culturally-appropriate, emotionally satisfying, and beautiful. Beauty & Aesthetics Evolve in Time It’s good to remember that what we find beautiful and appealing changes and evolves in time as well as across cultures. Here’s a wonderful demonstration: 500 Years of Female Portraits in Western Art. What Makes Design Beautiful? In the Interaction-Design.org chapter, Tractinsky starts with Vitruvius’ design principles. Vitruvius lived in the 1st century BC and develop a set of standard criteria by which to evaluate architecture: Firmitas — durability or life-span of the building in relation to its purpose; Utilitas — usability of the building by its intended audience; and Venustas — the beauty of the building (this would be culturally-specific). 2,000 years on and we still talk about durability, usability, and aesthetics of products. Since this chapter discusses architecture, I would like to talk about weapons. Weapons pre-date architecture, but they still follow the same rules for design: durability and reusability, usability, and beauty. If you’ve…