Who doesn't like tossing physics objects around?
All of these books can be picked up and thrown. For fun.
I feel that both Fingerbones and The Moon Sliver were lacking when it came to interaction, so for The Music Machine, I want to make every environment as interactive as possible. After all, videogames are an interactive medium. And I do want to figure out a way to make heavily narrative-focused text-focused games work as videogames, and not just feel like a novel chopped up between walking segments.
Basically, you will be able to pick up or examine just about everything in the game.