The great importance that has been given to teaching the theory of Relativity in intermediate levels by the new plans of secondary education, is often discouraged by the erroneous treatment of all these topics in the usual didactic formulations. So, in this work we dare to suggest a new point of view which is more accurately attached to the real and original spirit of the genuine Relativity. Our proposal lies on recovering in teaching the ideas of space-time and geometric representations introduced by Minkowski