A number of leading architects were employed to design the stations, with the lead being given by Roland Paoletti. It was decided from the outset that although each station would be designed as an individual entity, they would be linked by a common design philosophy and functional elements. Spaciousness was the most noticeable, along with the shared theme of grey and silver polished metal and concrete interiors. More subtly, many stations were designed to admit as much natural light as possible. At and to a lesser extent at Canada Water and , rotundas and shafts allow daylight to reach, or nearly reach, the platforms.