Abstract: The invention concerns a device that creates a semishaded surface whose level of exposure to sunlight can be determined and on which the sunlight can be distributed uniformly for a given period. It consists of a fixed framework (1) supporting a mobile reciprocating frame (2). A skylight (A) with slats is set into the mobile frame (2). The mobile frame (2) supports one of several frames (3) into which are set skylights (b) with slats. The adjustable deviation between the frames (2 and 3) determines the level of exposure to sunlight. This device is especially intended for persons who wish to be exposed to a reasonable level of sunlight. Its field of application is particularly, though not exclusively, in the tourism, leisure and accommodation industries.