小学錬画帖 巻之２
A Meiji-era Japanese primary school drawing primer, volume 2, written by Matsubara Sangorō and published in 1886 by the Okayama Prefectural Normal School for pupils learning to draw. The pictures are plain black-line diagrams of geometric shapes: a pair of tall slender triangles, a rhombus, a square with four inward-pointed star cuts, a pinwheel of triangles around a centre point, and a diamond divided by crossing lines. A designer could take from them a clear, rule-based way of building tessellated and folded geometric forms from simple triangles and rhombi.
