She used natural light because she had no formal training in artificial lighting.

Some are lightweight structures that leak heat, or have deep-plan forms that make artificial lighting and ventilation a necessity.

High-performance glazing maximises the amount of daylight that enters buildings, reducing the need for artificial lighting.

To observe this sight it helps to have clear air, a lack of clouds and being far from artificial lighting.

Before artificial lighting people went to bed earlier and didn't sleep through the night.