Best so far.
The big black paper is to prevent it from flipping, it can be thinner but didn't feel like doing it right. The bad thing is that it doesn't oscilate, as in goes up and down, it does in the first few seconds after throwing it inside then it just becomes static.

That's the best so far and actually the first experiment I did on friday






It should perfectly work with the books since they wouldn't flip if they are a bit thick, but I'd have to overuse magnets in the book, I think? plus I'd have to make custom transparent boxes for specific books, I'm going to design a box that can resize itself right now.
I'll do a scaled model with boxes right now, before I design the resizeable box, to see if it works on boxes.

P.S. It's a vodka glass wtf?