Johannes Tillich
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Johannes Tillich (1780-1807), a German teacher, who followed Pestalozzi's methods and advocated the use of visible and concrete demonstration in the teaching of arithmetic. Amongst other books on practical teaching, he published his Lehrbuck des Arithmetic in 1806, in which he describes the " bricks " he had invented. They consisted of a series of rectangular, simple solids of graduated sizes, which could be combined for the purpose of teaching elementary arithmetical relations. These are called TILLICH'S BRICKS.see http://m.vam.ac.uk/collections/item/O1256550/the-first-year-teachers-handbook-teachers-handbook-thompson-h-a/
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