The back of the napkin (Dan Roam)
Found this book in the library. The title caught my attention and I had to check this literature out. The back of the napkin? Yes, this book encourages to visualize in a simplified way your ideas and to use simple tools in creating a convincing presentation.
As a professional designer, it was refreshing to remember that it is very often a simple tool we can use to visualize complex ideas and stories.