This document discusses the relationship between form and content in information design. It presents four equations of form: form as formulation, variety, nature, and art. It also lists five thoughts about form: that form is based on a theme or idea; that form sets boundaries and limits; that form marshals materials to cast the theme; that form relates inner material to outer limits in harmony; and that form abolishes excessive content outside the theme. The document is titled "The Shape of Content" and references a 1957 book by artist Ben Shahn that discusses how form gives shape to content.