I had to sit on the glass floor, with my feet sprawled out on the edge. Reason being that I’m a big baby and was afraid I’d have an “accident” if I just stood there and looked down, unlike my companions who were real risk queens by comparison. I wasn’t the only person who was freaked out by the floor, by the way. If you are terrified of heights or experience vertigo, and your companions badger you to do this, sitting is better than spitting (up your lunch).