A didactic method for constructing matrices designed for spatial representation of molecules produced by assembling base materials comprising: - rods representing links between the atoms, - a spherical module made of a material into which said rods can be driven; - a support which can receive, in the center thereof, said spherical module and which makes it possible to produce the different hybridizing states sp, sp 2, sp 3 of the atoms characterized by link valences and valence angles in space, characterized in that the support is selected among: a) a square whereon two bisectors linking the middle of opposite sides are drawn, with said square having, in the centre thereof, a circle which is cut and is intended to receive the spherical module representing the links between the atoms which are driven into said spherical module; b) an equilateral triangle whereon the bisectors of each one of the 3 angles of the triangle are drawn, with said triangle having, in the center thereof, a circle which is cut and is intended to receive the spherical module representing the atom sp 2, and said bisectors guiding the positioning of the rods representing the links between the atoms which are driven into said spherical module; c) a tetrahedron having a circle cut in the center of each of the faces thereof, with said circles in the centre of said tetrahedron being a spherical hole intended to receive the spherical module representing the atom sp 3, with the apex of said tetrahedron comprising a tube which is inserted perpendicularly to the plane of the base of the tetrahedron, with said tube receiving one of the rods representing the links between the atoms previously driven at one point of the spherical module, and the base of said tetrahedron forming a pyramid, the 3 side faces of which form angles of 109°, with the edges between said faces forming grooves which guide the positioning of the 3 other rods which represent the links between the atoms which are driven into said spherical module. - rods representing links between the atoms, - a spherical module made of a material into which said rods can be driven; - a support which can receive, in the center thereof, said spherical module and which makes it possible to produce the different hybridizing states sp, sp 2, sp 3 of the atoms characterized by link valences and valence angles in space, characterized in that the support is selected among: a) a square whereon two bisectors linking the middle of opposite sides are drawn, with said square having, in the centre thereof, a circle which is cut and is intended to receive the spherical module representing the links between the atoms which are driven into said spherical module; b) an equilateral triangle whereon the bisectors of each one of the 3 angles of the triangle are drawn, with said triangle having, in the center thereof, a circle which is cut and is intended to receive the spherical module representing the atom sp 2, and said bisectors guiding the positioning of the rods representing the links between the atoms which are driven into said spherical module; c) a tetrahedron having a circle cut in the center of each of the faces thereof, with said circles in the centre of said tetrahedron being a spherical hole intended to receive the spherical module representing the atom sp 3, with the apex of said tetrahedron comprising a tube which is inserted perpendicularly to the plane of the base of the tetrahedron, with said tube receiving one of the rods representing the links between the atoms previously driven at one point of the spherical module, and the base of said tetrahedron forming a pyramid, the 3 side faces of which form angles of 109°, with the edges between said faces forming grooves which guide the positioning of the 3 other rods which represent the links between the atoms which are driven into said spherical module. a) a square whereon two bisectors linking the middle of opposite sides are drawn, with said square having, in the centre thereof, a circle which is cut and is intended to receive the spherical module representing the links between the atoms which are driven into said spherical module; b) an equilateral triangle whereon the bisectors of each one of the 3 angles of the triangle are drawn, with said triangle having, in the center thereof, a circle which is cut and is intended to receive the spherical module representing the atom sp 2, and said bisectors guiding the positioning of the rods representing the links between the atoms which are driven into said spherical module; c) a tetrahedron having a circle cut in the center of each of the faces thereof, with said circles in the centre of said tetrahedron being a spherical hole intended to receive the spherical module representing the atom sp 3, with the apex of said tetrahedron comprising a tube which is inserted perpendicularly to the plane of the base of the tetrahedron, with said tube receiving one of the rods representing the links between the atoms previously driven at one point of the spherical module, and the base of said tetrahedron forming a pyramid, the 3 side faces of which form angles of 109°, with the edges between said faces forming grooves which guide the positioning of the 3 other rods which represent the links between the atoms which are driven into said spherical module.