Operable windows, clerestory windows, solar chimneys, wind towers, green roofs, living walls, breathable facades, natural convection, stack effect, cross ventilation, single-sided ventilation, double-sided ventilation, thermal mass, insulation materials, earth tubes, underground spaces, atrium design, internal courtyards, tropical plants, dappled shade, warm natural light, soft diffused lighting, 1/2 composition, shallow depth of field, realistic textures, ambient occlusion.