This document summarizes a presentation on interface design given by Letizia Bollini. It discusses the evolution of interface aesthetics from early icons to flat and material design. It also covers usability principles and how aesthetics and usability relate. Key findings are that the medium shapes the aesthetic qualities, brutalism is defined by the platform not fixed signs, and future interfaces may incorporate spatial, multimodal, and sci-fi influenced elements. The presentation concludes that design must balance standardization with avoiding homogenization.