The plan of that floor is perfectly hexangonal. You can count the windows on the three visible sides and compare with floors up or down, where the window numbers become unequal due to the shape of the building. I tried to draw the hexagon in the right perspective to show the hidden sides. The bottom three sides are the other side of the symmetrical building. I maybe could have made them dotted, maybe I'll still do that.
The plan of that floor is perfectly hexangonal. You can count the windows on the three visible sides and compare with floors up or down, where the window numbers become unequal due to the shape of the building. I tried to draw the hexagon in the right perspective to show the hidden sides. The bottom three sides are the other side of the symmetrical building. I maybe could have made them dotted, maybe I'll still do that.