Mine would be the chair. Its something we overlook every day but comes in so many forms.
Personal favorite for me is the https://en.wikipedia.org/wiki/Wassily_chair
But there are many other chairs that I love. I like the security and grandeur of the wingback. I am not a fan of the ghost chair, no logic to my dislike other than it looks uncomfy and the hardness of it feels at too far removed from the french roots.