Abstract
International comparison studies (TIMSS and PISA) and teachers' expressed views indicate a decreasing trend in Czech pupils' competence in geometry. The present study describes an innovative educational strategy for teaching 3D geometry - the didactical environment Cube Buildings and how it fosters the development of spatial sense in the earliest school age group.
The results of one experiment in this environment are included as a partial result of a longitudinal action research project of one of the authors. The findings illustrate how a pupil can build problem-solving strategies and how knowledge is spread among pupils.