Filling the void of a physical whiteboard

We're pretty deep into the whole COVID thing. Where I am in the world, we've been in some variation of lockdown for nine months now. It has meant a lot of changes to my working life, but one of the larger changes to my workflow is that there's no longer a giant whiteboard mounted directly behind me. "Diagrams as code" tools such as PlantUML and Mermaid have gone some way towards filling the void, and I'll examine how far they go in helping me communicate software architecture.