What appeared alternately in the 20th century's sketches, his works attracted more attention.

Western sketches in the 20th century are called modernist sketches.

Its schools are varied and alternate. Picasso, Kandinsky, Dali and mondriaan. Is the most influential representative painter. Their sketches abandon the realistic modeling concept of classical sketches on the basis of anti-traditional concepts, and their works pay more attention to the expression of artists' inner activities and the innovation of expression forms and means.

In the history of world art development, after the paintings in prehistoric times, the most striking are the murals of ancient Egypt and ancient Greece, but they are rarely preserved due to the evolution of history. Judging from the only remaining incomplete murals, ancient Egyptian murals are still dominated by line modeling and have a strong oriental color; Although the ancient Greek murals are still dominated by the concept of line modeling, they have shown and evolved in a three-dimensional direction.