Slate (writing) Slate (writing) A slate is a thin piece of hard flat material, such as the rock also called slate, that is used as a medium for writing. The rock is “a metamorphic rock created by the recrystallization of the minerals in shale from clay to parallel-aligned, flat, flake-like minerals such as mica”. The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. A precise date range for writing slates of this type has not been established. Usually, a piece of cloth or slate sponge was used to clean it
Value-form subjects, and therefore human relations without values or valuations of some sort do not exist. At best one could say (as Marx did), that the type of value or valuation can change. A third objection is that people can distinguish quite well between the means/ends rationality of commerce, and non-commercial relationships. Therefore, it is simply an inaccurate and false subjective opinion to claim that there exists some kind of "monumental domination" of commercial relationships over people's lives, because that is not true—except perhaps for people who are obsessively focused on trading relationships. What is ignored is that markets can offer