The museum is quiet everywhere except here. Through the narrow window of a classroom door, you can see it: a room of restless students, a whiteboard covered in half-correct diagrams, and a curator gripping her notes like a lifeline. She's confident in her delivery. She's also wrong about at least three things you've caught in the last thirty seconds. The scheduled lecturer bailed an hour ago. She volunteered. You can tell she regrets it. You could walk away. Keep your afternoon simple. Or you could knock.