In some countries (e.g. Japan), the floor you enter the building at is the first floor, and in others (e.g. UK) it's the ground floor. So if there are 4 floors, they could be 1, 2, 3, 4, or they could be G, 1, 2, 3.

"The disgust was palatable."

So you enjoyed it? Where's r/boneappletea when you need it. (The word is palpable)