Einstein and physics of the second half of the twentieth century

Intuitive Einstein notions about the structure of the theoretical physics are discussed in general in the lecture dedicated to the centenary of Albert Einstein's birth. The Lorentz invariance in combination with the equivalence principle lead Einstein to the general relativity theory. He introdUced the principle which played a great role in the origin of different field theories: interactions are determined by symmetry. Einstein always emphasized the exclusive importance of the field concept as a basic one in the fundamental physics. The other important theme in the Einstein's approach to the bases of the theoretical physics was his attempt of physics geometrization. Einstein was fully aware of the necessity of the geometrical structures leading to the nonlinear equations. As it turned out nowadays the structure, which Einstein had searched for is a calibration field. Calibration fields are internally related with the general relativity theory based on the geometrical conceptions