Talking and transferring information is one of the most important activities in human civilization. Thanks to methods of communication like talking, presenting and writing, we are able to express ourselves, make impact on others and pass knowledge to the future generations. However, these processes are not always easy as it seems. It is usually more difficult than we expect. Even though listening and understanding comprehensively a talk is already not simple task, summarization our understandings is usually more challenging. Storing a transcript of the whole talk is an option which preserves its content the most. However, this is not even closed to summarization. It is too long and time consuming to review. A better way to logging a conversation or a talk is to use visualization techniques such as chart, diagram, visual expression and color. We will learn about these techniques and their applications during workshop “dialogue – 2 – diagram”. Knowing the use of visual presentations is a good start to diagraming. However, there are many cases in which our diagrams are as complicated as floods of text. One of the most infamous examples is a map of railway, especially the one of Tokyo railway system. There are too many lines which are entangled into a sophisticated transportation network. To clearly and precisely present these kinds of maps requires a very careful strategy of color selection, arrangement, and approximation. We will get a brief introduction about these methodologies in the second workshop about learning from maps. Our goal after two workshops is to have a better view on how to efficiently spread ideas and express ourselves.