Over the years our work has required lighting that was not readily available. For instance on fitting a steel gallery into a studio in a listed building (Norman Foster's old Hampstead house) we hung the entire structure on sixteen bolts and so did not want to chase electrical cables into the plastered walls etc. Instead we hung four 12 volt transformers from the ceiling and used these to power two exposed wires to which we coupled lights with crocodile clips. Later Peter Bell designed these light fittings that hooked onto cables and so Wirelights were invented. (Ingar Mauro independently invented the same sort of thing at about the same time in Germany he believes). Neither of them patented the idea and so now similar fittings can even be bought at Ikea.