Architecture diagrams often suffer from two problems: a) they try to serve multiple audiences using one overly dense diagram b) they often go stale. Diagram-as-code languages like PlantUML and Mermaid can help with more agile editing, but still doesn't address managing a mass of diagrams. Can we use functional programming techniques to generate diagram code at scale and manage its complexity? In this talk, we present a new library `temporal-diagrams` that helps users create their own DSLs for creating multiple variants of diagrams off of a single source of truth. This library uses functional programming patterns like encoders to target multiple diagram languages and provide flexibility in a principled way.