“Could we not reject the concept of matter and build a pure field physics? We could regard matter as the regions in space where the field is extremely strong. A thrown stone is, from this point of view, a changing field in which the states of the greatest field intensity travel through space with the velocity of the stone.” [1] Albert Einstein We propose a real experiment to falsify the geometrization of matter concept [2],[3]. A source emits a right-handed photon, the photon impinges almost perpendicularly a mirror being reflected to a detector set up to measure the spin of particle. The simplicity of the result of experiment (only two possible outcomes: spin is the opposite or the same ), and the fact that the experiment produces result that is direct evidence of the laws of physics makes it a very attractive and easy task even for students. However the result seems to be so obvious that no one has ever tried to do that!