Rice Pattern Solid Brass Spare Door Knob Set (Several Finishes Available)Solid Brass Door Knobs Rice Grain Round Style 2 1 4 inch Diameter Includes Two Spare Knobs and Passage Spindle The rice pattern, also known as rice grain or grain pattern, is a decorative motif characterized by small, repetitive raised dots resembling grains of rice. During the 18th and 19th centuries, with increased trade and cultural exchange between East and West, the rice pattern motif began to influence Western decorative arts and architecture.