Explore UX design fundamentals in this conference talk that delves into how users perceive application interfaces. Learn about Gestalt principles for grouping and highlighting, inattentional blindness, change blindness, and user scanning patterns. Discover techniques to promote clarity in interfaces through levels of emphasis. Participate in tests that demonstrate these principles firsthand, gaining insight into the challenges users face when interfaces are not designed with these principles in mind. Examine real-world examples, including Visual Studio's toolbar and elevator designs, to understand concepts like figure-ground relationships, similarity, and continuity. Gain valuable knowledge on color usage, data grid design, and the importance of archetypes and mapping in creating intuitive user experiences.