No matter how small the size of one's stash, it cannot be contained in one room.
Perhaps it is because yarn mates and produces more yarn.
Perhaps it is because yarn is clingy and follows one around to every room.
Perhaps it is just that it is easier to grab a quick fix of knitting when there are bits of knitting close to hand.
In any case, yarn will not stay in one place. I have been trying to cage it up for years and still find uncaged, wild yarn roaming the great vastness of my tiny house.
Do Borrowers steal yarn and move it about for the fun of befuddling me?