When I used to do musical theatre, my dad refused to come backstage. He never wanted to see the props up close or the sets up close. He didn’t want to see the magic.
If an item is not touched by an actor then it is set or set decoration – if it is touched by an actor, be it large or small, then it is a prop!
When you are working with props then there are a few rules and guidelines which you should stick to in order to stay on the good side of every stage manager.
Professor John P Palmer’s Theatre Essays