The mobile preschool, a preschool bus, was introduced in Sweden in 2007 in order to solve problems with lack of space for children in preschools. Cities in Sweden are increasingly making use of this way of organizing preschools. The bus hosts about 20 children and 3 teachers and drives to different locations, described as ´base camps where children explore nature together with their teachers’. This practice has not yet been evaluated. In this newly started project we ask questions as; how is the mobile preschool organized in time and space? How are the movements and moorings that characterize the mobility of the preschool bus used for children’s learning? How are knowledge and values constructed in everyday interaction in the mobile preschool? With theoretical starting points in time-spatial geography, mobility as moving and mooring, and learning in interaction we study the mobile preschool as a didactic space. The methods used are i) digital mapping of the bus’ movements and ‘base camps’ ii) video ethnography for studying learning in teacher - children as well as children – children interaction. In the presentation we discuss methodology and preliminary results from a pilot study of the mobile preschool in one Swedish town.