Explore the principles of functional programming and immutable data structures in Clojure through this comprehensive conference talk. Delve into the concept of "values" and composite values, and understand how Clojure's approach differs from object-oriented programming. Learn about Clojure primitives, collections, and powerful collection functions. Discover the efficiency of Clojure's data structures and explore the versatility of sequences. Gain insights into advanced topics such as the Grand Abstraction, map representation, and extracting interfaces. Master techniques for traversing and manipulating data using walk and zippers. Examine Clojure's approach to polymorphism through multimethods and protocols. Conclude with a practical demonstration using a cards example and a discussion on state models in functional programming.