I was watching Myst make his daily rounds to check on his special hiding places. He checks the closets and makes sure each one is cracked open just wide enough for him to go in and hide.
If a closet door is closed, he goes and speaks to the humans until they follow him to the closet where he sits expectantly until the door is cracked open, then he moves on. All he wants is a bunch of available dark hiding places, I think.
I stuck my head inside a door and could not find anything special about it. I don't get this hiding stuff. I prefer to plop down in the middle of things.