"Floor" and "Ceiling" in adv3lite

By default using the commands “x floor” and “x ceiling” results in this behavior:

[spoiler]>x floor
You see nothing special about the ground.

x ceiling
You see no ceiling here.[/spoiler]
Is there a simple way – without using the extension roomparts.t – to modify a room so that work gives a room a ceiling and recognizes that the floor is in fact the floor and not the ground? I would like to give responses that are more appropriate to indoor spaces but have no need to define behavior for four walls.

Maybe you could make floor and ceiling decorations?

fos1, still a newbie

That could work! Thank you!