Prasanna Revan gave a presentation on visualizing user experiences. The presentation discussed different types of interfaces that users interact with like graphical, touchscreen, gesture, and voice interfaces. It emphasized important elements of visualization like imagining new possibilities, empathizing with users, synthesizing ideas, creating new methods, and fine-tuning designs. The presentation provided examples of visual design strategies and covered composition, grids, navigation, page types, contrast, typography, color palettes, and artifacts to refine designs. The goal of visualization is to change something in the world by creating outcomes, not just deliverables.