It sounds pretty, but I'm not convinced this is a sound analogy. I think the walls are elastic to some extent. The real limitation on how much you can learn is

It sounds pretty, but I'm not convinced this is a sound analogy. I think the walls are elastic to some extent. The real limitation on how much you can learn is not storage space, but time spent "moving furniture". You only have so much time to spend learning things, and you have to choose where to allocate it.