The Irregular Polygons (1965 - 66) broke with the conventional rectangular format of easel painting, as did the early 1960's notched aluminum paintings. (wahlstedtart.com)
It was at Yale that Marden developed the formal strategies that would characterize his drawings and paintings in the proceeding decades: a preoccupation with rectangular formats, and the repeated use of a muted palette. (wikiart.org)
On the adjoining wall, the gray repeats in a long rectangular format framing the text «omaobamaoldsmobile.» (tanyabonakdargallery.com)