Did you ever wonder why Doctor Who‘s TARDIS was externally a UK Police Box? well wonder no more; apparently the TARDIS (which stands for Time And Relative Dimension In Space) was built with a ‘chameleon circuit‘ which enabled it to blend in with its surroundings. However that circuit broke in the 1960s in Shoreditch, London. So now it will always be stuck as a Police Box.
The first Police box was installed in 1877 just a year after the telephone was invented by Alexander Graham Bell. Until the 1960s most of them were coloured red. Blue was introduced in the early 1960s. They were phased out around 1970. Although some UK cities have experimented with bringing them back in some form during recent years.