Ancient desert dwellers invented blinds to balance light and air

Before the invention of adjustable slats, managing a home's environment was a binary choice. Ancient homeowners could either block a window with animal skins to keep out the heat, which also cut off all airflow, or leave the opening clear and suffer through the direct glare of the sun. The breakthrough came from observing how simple reed mats allowed breezes to pass through small gaps while still casting protective shadows.