My world is not your world, neither is your world my world. This creates many problems for both humans and cats.
In my world, when we are anxious about feline intruders, we mark our territory with urine. It's somewhere between a post-it reminder note to ourselves about the problem and a note to other cats telling them we were here.
In your human world you'd probably install a burglar alarm. Or a notice saying "Private. Trespassers keep out."
My world is full is strange noises - the high squeaks of the washing machine when it is working, the buzz of electrical appliances heating up, the tiny tiny clicks of a boiler. All noises you can't hear. You don't even know they exist!
So you think it is all right to put my litter tray in the utility room, next to the washing machine. It isn't. Those squeaks are very very putting-off. A quiet elimination is impossible.
Humans, pay attention to my world. Try to think yourself into it and remember everything is different for me.