Barnett Newman is also regarded as a significant figure in Abstract Expressionism. Similar to Rothko, Newman is considered a "color field" painter. His style differs from Rothko's in that Rothko mainly focused on large horizontal planes while Newman used strong vertical planes. Newman would often create a large field of color and divide it with vertical lines or "zips". Newman often experimented with unorthodox dimensions for his work. Sometimes his paintings would be shorter in breadth than the depth of the frame.