More about realia
Realia comes from the Late Latin adjective reālia “real things, facts,” the neuter plural of reālis used as a noun. Reālis is a derivative of the noun rēs “thing, matter, affair” (three of the word’s many, many meanings). The earliest English usage of realia referred to German culture and educational systems, specifically the Realschule, a secondary school specializing in practical subjects rather than the liberal arts. In the United States since the late 1890s, realia have meant ordinary, everyday objects used as teaching aids for children. This is nothing new: in the first century a.d., the Roman rhetorician Quintilian recommended using large letters carved of wood, easy for children to handle, to help them learn the alphabet. Realia entered English in the first half of the 19th century.