The pools of soft yellow light cast on the pavements of night-time Berlin by the city's thousands of historic gas street lamps can give visitors a thrilling sensation of having either walked back in time or straight on to the set of Cabaret, the award-winning film set in the German capital of the early 1930s.
Berlin has a record 43,900 gas street lights - more than any other city in the world. They range from ornate wrought-iron five-lantern candelabra dating from the 1890s to graceful curved arc lights lining the city's thoroughfares and installed in the 1950s.
But the city's Social Democrat-led administration has plans to bring its 180-year-old tradition of gas street lighting to an abrupt end. It argues that they are too costly and environmentally harmful, and it has begun replacing them with an electric equivalent.
The city's heritage movement is, of course, not happy. Under current plans, nearly all of the gas lamps will have been replaced by a more economical type of electric lamp called Jessica by 2020.
The city's Department for Urban Development claims that, by eliminating gas lighting, Berlin will live up to its environmental obligations, cutting 9200 tonnes of CO2 emissions. The city's Green Party agrees.