In visual art, this often takes the form of flat planes of color placed next to or near each other in a painting or print. (artspace.com)
Often I'll leave the cookies round, but I have also molded logs into simple geometric shapes by pressing down lengthwise along the log while the dough is soft to create flat planes. (bonappetit.com)
Due to the design of the base, the rear of the opposite painting is seen behind the person, where flat planes of colored paint produce a loosely articulated second figure. (arthaps.com)