What is the difference between western modern painting and classical painting before the 20th century?

In the 20th century, western modern painting broke through the traditional focus perspective and developed into different styles and techniques. It broke through the strict constraint of objective natural form on art, and the simulation and reproduction of nature evolved into subjective transformation according to the spiritual needs of the self. In this transformation process, spiritual feelings have played an important role. Although the contents expressed in art are not completely in line with the original appearance of nature, they are subject to real visual feelings and internal spiritual needs. The transformed shape is essentially different from the original state, and the viewer can appreciate the differences of aesthetic tastes of different individual artists when transforming the shape.

And the classicism you mentioned before should refer to neoclassical painting. Neo-classical painting takes the aesthetics of Renaissance as the guiding ideology, advocates antique, rational and natural, and is characterized by choosing serious themes; Pay attention to shaping and integrity; Emphasize rationality and ignore sensibility; Emphasize sketch and ignore color. The representatives of neoclassical painting are Louis dawit and Angel.

Generally speaking, classical taste emphasizes rationality, and its formal characteristics are especially manifested in attaching importance to sketch and ignoring color; Anti-classicism is keen on emotion. Unlike classicism, it does not pursue the classical meaning of solemnity, silence, simplicity and harmony, but emphasizes the spirit of freedom and indulgence, the richness and grandeur of momentum and the spirit of turbulence and agitation.