I have to know where my stuff is at all times. I get really anxious if I'm missing something. Like one day, I couldn't find my black shorts and I was at work freaking out about them. I wasn't even home and I was going nuts wishing I could BE home to look for them. I needed to know right then and there, but couldn't, so it just ate at me til my sister sent me a pic of them cause she found them. I was relieved.
That all being said, I don't like people picking my clothes off the couch. We all do the laundry here at home and it all goes to the couch for us to sift through and get ours. Sometimes, someone attempts to put everyones' clothes in a pile, but it ends up being bad. I'll be missing something or get someone else's clothes or whatever. And that leads to MORE freaking out about not knowing where things are.
As far as moving things, I will pitch fits. I once came home to find someone cleaned my room and moved some of my furniture ever so slightly as if I wouldn't notice. I completely freaked out to the point of crying because in my world, everything was off balance. The worst thing you could ever do is move or change my furniture without my consent. I've always been that way. I once told my mom she had to send our new glass table back because I didn't like it.
This was a lengthier reply than I originally anticipated...now you can all read about how crazy I am. The moral of the story is...never move, touch, or take Syd's things.
Edit: I've also heard of cases where parents will go through their kids' stuff and throw it out or sell it without consent? I'm really thankful I never had to deal with that. My mom always let me choose what I didn't want anymore and what I wanted to keep. I guess she learned everything I said in this post early on lol.