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a sunspace (a), floods a space with light, which may cause fabrics to fade. An indirect -gain system,such as a Trombe wall (b), provides heat while blocking the light.Figure 12: First generation sunspaces (a) usually protruded from the house. New sunspaces (b) areoften two story designs set into a house's south wall.A Trombe wall is a masonry wall with glazing spaced a few inches outside it. Solarheat is trapped between the masonry and the glass; it enters the house by migratingthrough the masonry. Whereas the direct-gain window and solarium are virtuallytransparent,creating strong spatial connections between indoors and outdoors, theTrombe wall obstructs views to the outdoors, so it works well on a site where asouthern view is not desireable. If you do want a south view, however, yu can placewindows in a Trombe wall. Variations on the Trombe wall include half -Trombe350