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Figure 3: Internal mass storage walls serve as north-south partitions between direct -gain spaces (a)and as east -west partitions between direct-gain sunspaces and north clerestory space (b).Lightweight objects and surfaces of low density materials should be light in color toreflect energy to high density materials. If more than one -half of the walls in a directgain space are massive, then they should be light in color. If the mass isconcentrated in a single wall, then its color should be dark--unless its surface isstruck early in the day by sunlight, in which case its color should be light to diffusethe the light and heat into the rest of the space. Massive floors should be dark in330