This document discusses various topics related to innovation including the adjacent possible, exaptation, error, serendipity, and more. It provides examples of innovations that resulted from mistakes or errors such as Post-it notes and Silly Putty. It also discusses how new possibilities can emerge from exploring adjacent spaces and how exaptations can help discover new doors. Mutation, error, and serendipity are said to help unlock new possibilities lurking behind doors in the adjacent possible.