And all of them were art. The school of art devoted to everyday, ready-made, objects was called Dada. Duchamp was a founding member. Dadaists provoked people to view their everyday surroundings with new eyes. We are surrounded by objects.
All objects are potential art objects.
If you examine an object with artistic eyes it is art. If you call it art it is art. A bathroom is a musueum. The point was to examine everyday objects with new eyes. Wake up and look around.