This graduation project deals with the revitalisation of the former V&D department store in Haarlem. The building is transformed into a mixed program, consisting of dwellings and the library of the 21th century. This is not a regular library, on the opposite it is an easily accessible public building which functions as a central meeting place within the city. In this project the main theme is daylight. This varies from the practical side of applying different daylight adjusting measures to the more poetical side of introducing principles (regarding daylight) to influence the perception of spaces.