A television studio can seem impressively complex for a non-expert. In fact, when some easy concepts are understand, all those structures look more familiar. The lighting grid is made of metal pipes. The metal pipes are strongly fixed together like a ceiling. In fact, it creates a second floor so the lighting technicians can walk on it. The technicians put and remove lightning spots on the grid, to light the actors. There is a complete described procedure to get up and get down lightnings, since it can be a dangerous procedure (spots can be really heavy and they could fall from high).