Engineering works for the major extension of the Metro in Copenhagen has meant that many streets and squares have been blocked or screened off with hoarding, said to be in total 6 kilometres long, and in some places the hoardings are 4 metres high. This has become almost a permanent part of the city streetscape and the work is not scheduled for completion until 2018.
Metroselskabet, the company behind the project, came up with a scheme for artists and children in the city to use the hoardings as a canvas not only for street art but for communication and as a backdrop to installations.
A section at Kongens Nytorv has a series of hinged flaps with black on one side and sharp strong colours on the other. A ladder is provided and kids seem to have great fun flipping over various combinations to form letters (usually their name) or patterns. There is usually a dotting parent there with camera ready to record the result.