According to quantum physics, "two objects can't occupy the same space
." However, I have it on very good authority that certain cats are out to change this rule.
Normally, Olivia occupies space in a rocking chair.
Her son Jim-Bob occupies space in a basket on my desk.
Sometimes Eddie-Puss occupies part of my desk-top.
Once in a while, Olivia decides that she'd like to occupy the basket. Jim-Bob, however, doesn't want to give up his space. Crowding ensues. The two separate objects—in this case, felines—attempt to defy the law of physics.
Wisely, Eddie-Puss does not attempt to occupy the space inside the basket. He doesn't like to be crowded.
I'm pretty sure he doesn't care about physics, either.