Organic molecular model assembly

A color coded molecular model assembly kit for representing complex organic macromolecular structures and shapes, comprising two basic and complementary construction units capable of being interlocked, said first basic construction units being color coded tubes to represent at least the major part of the bonds of joined atoms or organic molecules consisting of three different lengths of said tubes;

• said lengths being such that when coupled to two of said second basic construction units the distances between the centers of the coupling means represent and are substantially proportional to 1.36 Angstroms, 1.54 Angstroms and 1.81 Angstroms respectively and said second basic construction units being color coded coupling means for said first construction units according to the valency of each said atom and centers of said coupling means representing atom centers, said coupling means having radial arms for precisely positioning said tubes, said radial arms being rods substantially located on the surface of a sphere with the center of the coupling unit being the center of the sphere, wherein said first and second construction units are made of plastic and are capable of being joined together and held immobile by friction by having said radial arms and/or the cavities of said tubes tapered so that a rigid bond is formed when said tube is pressed firmly onto the arm of said coupling means so that models of complex organic macromolecules may be constructed such that the distance between the centers of two coupling means represents and is substantially proportional to the distance between joined atoms, at least one type of said coupling means adapted for planartrigonal coupling of three said tubes separated by angles of about 120.degree. and/or adapted for tetrahedral coupling of four said tubes separated by angles of about 109.degree..