We all have had those types of times where ur just sitting there and like 10 feet away a book falls off the book shelf for no reason. What causes that? Possibly a collision or glitch from a diferent reality? no, maybe, but what?

The first thing that would come to mind is gravity.

but how could gravity pull a book off a shelf?

I'm sure theres a more logical reason. But idk it. Can it be small scale earthquakes that happen all the time. Or maybe just maybe its your cat idk.

Gravity works pretty much the same way throughout. Maybe the book was slightly off-balance and took a while to topple. Maybe the shelf was slightly off kilter and the book slowly slid over the side.

Heck, maybe a kitty was walking behind it and pushed it off.

There are a variety of ways the book could have fallen that don't involve metaphysics, quantum science, or dimensional collisions.

Ever made that jumping traingle out of a paper clip? That's kinda the same principle combined with what causes earthquakes.

It should have fell already, but a bit of something is stopping it, over time eventually it gets to a point where it's just gotta fall.

Stacking dishes randomly in a sink and 20 min later a spoon falls off.

Also could be helped along by vibrations like walking, or the house settleing.

Clide = Collide.

If it is sitting normally on a bookshelf, it wont fall, as gravity pulls the book onto the shelf. If it is at an odd angle, gravity will be acting on it, and something is stopping it from falling, such as another book. Eventually, this book might (not in all cases >_>) give way for the one at an odd angle, causing it to fall....