I live on the 13th floor. I have a balcony with a metal balustrade which I thought was quite safe until I adopted a cat last Sunday. There is an 80mm gap between the last balustrade and the wall at each end. There is a 200mm ledge beyond that on the outside of the building. Sid the cat decided it was a good idea to go through the gap and have a walk on the high, wild side and nearly gave me heart failure when he appeared OUTSIDE the bedroom window crying. I lured him back with food but it can't happen again. Any suggests for filling the gap - I own the property but it needs to be discrete so as not to upset the Owner's Corporation. Thanking you in advance.