I understand your fear, tanith - it’s a very strange feeling being on and against glass balconies and floors, our brain is registering the drop. It’s not a sensation I like, and remember once in France we visited a castle where they had built a glass floor between one level and the next. It was very disconcerting and I had to walk around the edge where the glass was opaque rather than the rest of the floor which was clear as my brain was telling me it was a long drop and I’d fall, even though I knew this wasn’t possible. The glass they use is extremely strong and toughened, so is quite safe, but nevertheless, I disliked the sensation.