James Siena
 James Siena (born October 28 1957) is an American contemporary artist based in New York City. His art is typically created through a series of self-imposed constraints also sometimes referred to as visual algorithms —rules Siena decides on before sitting down to work. In most of his work he establishes a basic unit and action and repeats it indefinitely. Siena commented that at a certain point I wanted to make drawings and works that act as machines.