Abstract
An illusion of undecidability of an ether wind was the basis for establishing the theory of special relativity (SRT). The reason to that mistake was a wrong interpretation of light behavior in both arms in the Michelson and Morley’s tests (MMX), and also in the interpretation of stellar aberration. A deviation from the wave model gave us the illusion of particles in light, and also resulted in the absurd idea that the time concept is dilated, due to velocity.