Abstract Expressionism An art movement of the mid-20th-century that was primarily concerned with the spontaneous assertion of the individual through the act of painting. Generally, Abstract Expressionist art is without recognizable images. The Abstract Expressionist movement was centered in New York and is also called the New York school.

Assemblage A work of art composed of materials, objects, or parts originally intended for another purpose.

Collage Two-dimensional works made of pasted paper pieces, cloth, or other materials.

Gesture A movement of the body or limbs that expresses or emphasizes an idea or a feeling.