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The room with no walls, floor, or ceiling is a "mushroom." This is a riddle where the term "room" is used in a playful way to describe the structure of a mushroom, which has a cap and stem but lacks the traditional boundaries of a room.
10 feet
It would depend on how it is being used, but I would think it is referring to an amount of money or a number of items. A ceiling is the stopping point in a room so that's as high as you can go. Example, The ceiling on what I will spend is 3 million.
The floor or ceiling of a rectangular 11' by 12' room.
Ceiling tiles are not all the same size, but I have often seen them in the size one foot by one foot.