When you design a mega structure like an airport terminal it is assumed that you will take into consideration every possible thing that can go wrong. Apparently the designers of Heathrow Terminal 5 seem to have gotten the basic concept wrong. As per a story published by Gizmodo, nearly 60% of light bulbs in the terminal are non-functional due to lack of a cost effective solution to fix them. So how does the terminal intend to solve this problem? Well the airport wants to hire tightrope walkers to fix them. So much for spending of billions of dollars to create a world class terminal and then stumbling over such small oversights. If only they had thought of this while designing they would have been spared of all such headache.