Explore the revolutionary GUI applications of 1972 built in Smalltalk and learn how to apply their principles to modern web development in this JSConf EU 2019 talk. Discover the power of asynchronous message passing, object orientation, and functional programming that enabled features like bitmap graphics, draggable elements, and drop-down menus. Compare these groundbreaking techniques to today's monolithic web application structures and understand their limitations. Delve into the lessons from early UI development, languages like Erlang and Smalltalk, and the Actor-model. Gain insights on how to implement these concepts in contemporary web applications to create more dynamic and efficient user interfaces. Journey through the history of UI development and emerge with practical knowledge to enhance your web development skills.