The sun is an extraordinary source of natural light: we only need one hundredth of the amount of direct midday sunlight falling on a desk for us to be able to see very well. Buildings should be designed to use this free resource even where electric lighting is available.
As our workspaces and schools become more dependent on computer screens the levels of ambient light can be reduced and too much glare can cause discomfort. Ideally some flexibility is therefore required to control the quality of natural light we admit into our buildings.
Blinds and shutters can control the quantity of sunlight and turn glare into diffuse light. Moveable controls allow daylight to be adjusted.