The paper discusses the use and possible applications of stereoscopic projection and anaglyph representation for the design-process and visualization of architectural spaces and three-dimensional objects. As the topic of stereoscopic vision is quiet broad and has a long tradition in various fields (photography, art, virtual reality) the paper focuses on the implementation of anaglyph representation in 3D-Modelling-Software as a tool to support spatial perception within the design process. Against this background and based on a test-series with 113 students the benefits and conditions of spatial perception, vision and sense using anaglyph representation are examined.