Constructs named for this concept were first demonstrated with an example where pillars, slabs, and beams are passed between a builder and his assistant. A focus on everyday instances of this concept characterizes an “ordinary” philosophical method followed by J. L. Austin. Gottlob Frege (“FRAY-guh”) is often credited with starting the “turn” towards this concept that began analytic philosophy. The “beetle in the box” thought experiment was used to argue that private examples of this concept cannot exist by Ludwig Wittgenstein. A field that studies these systems has branches like pragmatics and semantics. For 10 points, (10[1])name these systems studied in linguistics. ■END■