It is both impossible to make something from nothing, and nothing from something. Anything we produce must come of raw materials, and once we consume it, it results in waste.
The raw materials and the waste must coordinate and articulate with each other or the system becomes unsustainable. Sheviit performs both functions. It recognizes the property of the raw materials as belonging to a higher authority; and it allows the land to process the waste matter that comes of a too-unrelenting exploitation of the soil.
Sheviit is thus constituted of two aspects: the suspension of the exclusionary rights that come with private property; and the cessation of the cultivation of the soil even were it done as collective property. The cessation addresses the problem of pollution.