At the end of the 18th century, and during the 19th century, Paris experienced a huge growth in population, consumption, and trade. In this context, easing the circulation and the salubrity were growing preoccupations of the administration. Streets had then to be clean and free. Dirt and sludge were considered as indesirable, as every use of the streets that was not dedicated to circulation: games, music, etc. They were to be eliminated, with the aim to create a functionnal street as a factor of hygiene and wealth.