Add a single large whiteboard to a room and it stays a board in the room; cover the whole wall with one and the room itself starts to work differently, becoming somewhere ideas get built up over a session rather than written and erased on one panel. That shift changes meeting culture as much as it changes the wall, which is why it is worth deciding deliberately rather than defaulting to whatever fits the available budget. Get the decision right and the room earns the investment in how it actually gets used, not just in how much space it gained.
