style or movement in the arts that aims to depart significantly from classical and traditional forms.
modern character or quality of thought, expression, or technique.
1. style
2. shape
3. color
4. line
5. contrast
6. movement
7. balance
8. tone
9. texture
Pablo Picasso
In his paintings, Picasso used color as an expressive element, but relied on drawing rather than subtleties of color to create form and space. He sometimes added sand to his paint to vary its texture
modernism is what happened to art and philosophy in the early 20th century. It was a reaction to technology and science, against the cultural norms that had come before. It's most clear in art, which introduced non-realistic forms of painting like impressionism.
I associate "postmodernism" most closely with its philosophical expressions, trying to puzzle out the nature of "meaning" and discovering that in many ways meaning is more arbitrary than had previously been thought.