Maurice Prendergast's sketchbook study depicts a harbor view near the Granite Shore Hotel in Rockport with loose graphite underdrawing and luminous watercolor washes that capture the atmospheric effects of coastal light. The artist's characteristic use of color notations directly on the page reveals his process of documenting chromatic relationships and compositional possibilities for larger works. This intimate sketch exemplifies Prendergast's innovative approach to plein air practice, where notation and spontaneous observation merge to create a dynamic record of place and sensation.