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Roman townhouses rarely had windows, as they often had very little exterior wall. Where present, windows were placed above eye-level, and they were small[4] and contained clathri, window lattices.[4] The compluvium provided most or all of the light to the atrium, its alae, and the adjacent cubiculums. The doorways of the cubiclums were usually arranged to maximize the light, and when present, the alae were often needed to let light into the rooms flanking the tablinum.
Wikipedia contributors, "compluvium," Wikipedia, The Free Encyclopedia,
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