Roman Tschäppeler and Mikael Krogerus explain the essence of decision making on an old school blackboard. Their keynotes are full of insights into the psychology of choice, all wrapped up in a playful way. Why can’t we make up our minds? How do I limit my options? And what do Donald Rumsfeld and Yin and Yang have in common? Their one-of-a-kind visual storytelling offers a fresh look at decision behavior.