Barnett Newman, The Wild, 1959
From Wiki Paintings:
The Wild is unique in Newman’s oeuvre by virtue of its unusual size: at eight feet tall by one and a half inches wide, it focuses on the zip alone. When first exhibited it was placed directly across from the vast Vir heroicus sublimis, and was said to be a response to the latter’s sprawling size. It demonstrated Newman’s belief that a painting need not be physically large to inspire an intense response from the viewer. The Wild could also be regarded as one of the first of the shaped canvases that became popular over a decade later with the arrival of artists such as Frank Stella and Kenneth Noland.