Ai Weiwei, 2010. 100 million hand-painted porcelain seeds covering the Tate Modern Turbine Hall — installation as painting-counterpart.
From Wikipedia
A sunflower seed is a seed from a sunflower. There are three types of commonly used sunflower seeds: linoleic, high oleic, and sunflower oil seeds. Each variety has its own unique levels of monounsaturated, saturated, and polyunsaturated fats. The information in this article refers mainly to the linoleic variety.