Spatial software is the idea of bringing spatial interfaces into software. So far it’s most commonly been in games, but you can see it spilling out into more things lately, particular social stuff.
Like a remake of AIM, where each user gets a house that friends can stop by to visit.
This is kind of what I was thinking with wikis and collaborative memory palaces.
In fact, you can put a world inside of almost any interface. Even a blog post.