Some points about dust

What is dust? Basically, ordinary house dust is a mixture of dead insect parts, flakes of human skin, shreds of fabric, and other unpleasing  materials. Road dust consists of deposition of vehicle exhausts and industrial exhausts, tire and brake wears, dust from paved roads and construction sites.
What is the relationship between dust and architecture? In my opinion, dust witnessed the evolution of architecture, and also was the participant in the process. It formed and undid the buildings directly or via interaction with the environment around buildings. After that, in different historical periods, dust played different roles on architectural atmosphere. For instance,  the dust of London under bombardment during World WarⅡ differed from the great London smogs of the postwar period.
Dust, which contemporary sensibility is disposed to consider only as pollutant, also reveal a history of beneficial service to humans, an example of this, dust has furnished rich minerals and supplemented  soils. it has been used to make bricks, ceramics and glass.
Dust could bring smells to architectural environment. the fresh air from green land, the air mingling with water and vapor and forming snowflakes, fire filled the air with the smell of burning wood, and the smell of sea salt could reach far inland when the winds were right.
Some other dust served cosmetics with colors and powders to beautify the buildings.