With this series of eight pieces entitled Inversiones (Investments), Ángel Mateos culminated his first abstract period. In it he returns to the verticality of the Menhirs but inverting the order: in this case he places the main knot at the top, prolonging its ends and turning them into pillars on which it is supported. This seems to suggest that these works can grow. Mateos will begin to say that his sculptures are "models of themselves".

Most of these works seem to demand monumental proportions; there is something in them that forces us to imagine other dimensions, as if they were crying out to be made on a large scale, claiming a primordial sense of monument. They will be a reference to that useless and beautiful work that we carry in our imagination.