Sealey, Leonard2019-05-292019-05-291965Sealey, L. (1965). Structural apparatus. Symposium: A Journal of Education for Southern Africa, pp. 43-48.https://hdl.handle.net/10539/27342enUniversity of the WitwatersrandaUnifix (mathematics education)Cuissenaire Rods (mathematics education)Stern materials (mathematics education)Dienes Multi-Base Arithmetical BlocksCognition in childrenArticle