The circular economy is an economic system based on the reuse and regeneration of materials or products. While the notion was first theorized in the1930s and evolved into a movement with the book Cradle to Cradle in the early 2000s, many cultures and communities have already been following a reuse lifestyle for generations. While the circular economy relates to any type of consumer product, it can be especially impactful when applied to the buildings where we spend our time. Our buildings contain thousands of materials and products, most of which are sent to the landfill at the end of use. But there are ways in which our buildings can help preserve our health, the environment, and our culture.