It’s free. Use it. Design with it in mind. Natural light = equity. More natural light = less artificial light. It feels good. Workers appreciate it. Light chases away inhibition. Natural light does not have to be hot. Natural light is from the sun. The sun moves. Design with natural light is more advanced than design with artificial light. Artificial light is fake. CFLs + incandescents are artificial light. Artificial light requires electricity. Electricity can be used for other things during the day besides artificial lighting. Artificial light is man made. Natural light is not man made. Animals are cognizant of day and night. The day/night distinction is irrelevant to humans. Natural light comes from one source. Artificial light radiates from countless sources. Natural light = gift. Artificial light = debt. Image via.