This chapter explores how the project of improvement, which extended far beyond the elites who operated in the university and the scientific society, disseminated new standards of judgment and rationality. In recent years, historians have found new ways to understand the popular Enlightenment, that curious zone between authoritative knowledge and diverse opinion. All of those routes are useful in approaching the popular experience in the Languedoc. The hypothesis of the “public sphere” inspired historians to rediscover the public use of reason by theatre audiences, newspaper readerships, and crowds at exhibitions without the prominent writers who were important sources of authoritative ideas. The chapter also explains how progress could be marketed in the form of medicines, clothes, or foods. Consumption was a practice that went far beyond objects; there was a sphere of public science, and a market for scientific lectures and displays, in eighteenth-century Paris and beyond.