The equality of two sides of thinking - rational-logical (theoretic) and emotional-image-bearing (artistic) - in human development is stated. It is necessary to regain their harmony in educational system. The forms' of cognition and its object's interconnections are analysed. Constructive, graphic and decorative ways of artistic-image-bearing cognition are considered in detail. The art is stated to be the irreplaceable form of self-consciousness and self-organization of human collective in absence of which human society is impossible.