This document outlines Dan Roam's presentation on visual thinking and problem solving using diagrams on napkins or whiteboards. The presentation includes exercises where participants draw diagrams to represent themselves and others, as well as frameworks for visualizing different types of problems related to who, what, how much, where, when, and why. It encourages attendees to develop their own universal problem solving toolkit using visual diagrams with multiple elements. The goal is to demonstrate the power of visual thinking to help understand and communicate about problems.