Built in 1986, Metso, the internationally renowned Tampere main library, is an important feature of the local cityscape. Because of its irregular shape, the library’s structures are varied, and each is unique. The library was designed by architects Raili and Reima Pietilä in 1978. This building was renovated in four stages, the last of which was completed in 2017. In conjunction with the renovation, the library’s functions and acoustic properties were brought up to date and adapted to meet the needs of current activities. In addition, the basement space was converted to library use.