If you think of the index as an offset you would start with 0.
BTW on which level is the 1st floor?
BTW on which level is the 1st floor?
in Europe or in the US?
In English you count "floors" and floor is a usable, hard surface on which you can put something, like a chair. That's why a floor on the ground level is treated the same as the floor above it - it is equally good on accommodating chairs, beds, and other stuff.
Etymologically, étage comes from the Greek στέγω (and gave the English word “stage”); it is a typically wooden cover. Since the first floor was often instead a continuation of the outside road (way back!), it was not considered a “stage”.
Again, this is more a spoken language/culture thing, and this goes back to what premises we use to communicate with the machines, ours or the machines...
No elevator I've seen has yet taken a cue from UI design: simply put the buttons within an outline of the building, along with the local numbering scheme.
No more visits to the serial killer lurking in the basement.
The players in this market evidently have been operating at T'ump levels of intelligence. /s