School imaging means all of the images used in schools to explain or illustrate the taught knowledge. Example of a wall chart , late nineteenth century, by explaining the image metric . The training materials used by school teachers and professors to illustrate or accompany their course consists of wall posters , illustrations in textbooks , decorations and colors of architecture, costumes or symbols in a school. Wall maps , educational boards , educational charts , synoptic , posters, timelines are some such examples.