The movement known as stressed the power of imagination and dreams over conscious control.

The answer to the blank space in the question is an art and literature movement called surrealism.

Surrealism is a 20th avant grade movement that began in the 1920s. Some popular artists that are associated with the movement are Frida Kahlo, Salvador Dali, and Pablo Picasso. The movement is partly influenced by several art movements that preceded it, notably abstract expressionism and post-modernism.