If you mean that literally, the answer would be earthquakes, or the owner wanting to rearrange or remove them. Otherwise the contents might move you, if it is a story that touches you deeply.
Yes
cause the books are very funny
cause they liked books
any one that can be moved
Plate Activity causes it to move.
cause he wants to
cause if they were binded on the right we would have to read Japanese style books.
No, convection currents in the upper mantle cause tectonic plates to move.
Because the pencil pull upwards 5 times so it is caused the book move! people
I believe they are small microscopic bugs called paper mites...they cause small bumps that itch
Cause he feels like it!
cause i don't rent my eyeballs