The Realistic Manifesto - 1920 [mp3], written by sculptor Naum Gabo and cosigned by his brother Antoine Pevsner, is a key text of Constructivism. The manifesto laid out their theories about artistic expression. The Manifesto focused largely on divorcing art from such conventions as use of lines, colour, volume, and mass. They also believed art should accompany man through all parts of his life: "at the workbench, at the office, at work, at rest, and at leisure; work days and holidays, at home and on the road, so that the flame of life does not go out in man."