This white paper discusses using visual pictures or diagrams to fully understand complex concepts and communicate them effectively. It argues that drawing a picture forces one to summarize their thinking in a static visual, demonstrating a deep understanding of the topic. The paper provides examples of diagrams created by the author to illustrate business strategy and architecture. It recommends starting with a detailed diagram, then summarizing the concepts into progressively smaller diagrams to fully internalize the information before being able to discuss it fluently.