Studies of office workers, web designers, and oral historians have found that even in the digital age (and sometimes because of it), we are using paper more and more. The paperless office is a myth. The paper-saturated office is not a failing of digital technology; it is a validation of our expertise with the physical world. We use paper, and writing surfaces more generally, in their myriad forms: books, notepads, whiteboards, Post-it notes, and diagrams. We use these physical artifacts to read, take notes, design, edit, and plan. Here, we present a toolkit for building vision-based tangible interfaces. We also present the user-centered design methods we employed to build this toolkit.