<b>Irvin argues that rules are the key to understanding what''s going on in contemporary art.</b>Contemporary art can seem chaotic: it may be made of toilet paper, candies you can eat, or meat that is thrown out after each exhibition. Some works fill a room with obsessively fabricated objects, while others purport to include only concepts, thoughts, or language. Immaterial argues that, despite these unruly appearances, making rules is a key part of what many contemporary artists do when they make their works, and these rules can explain disparate developments in installation art, conceptual art, time-based media art, and participatory art.Sherri Irvin shows how rules are now an artistic medium: they are part of the work''s structure and shape what it expresses. Rules are meaningful in themselves and help to activate the meanings of non-art materials and found objects, so audiences need to know about the rules to get the most out of their art experiences. Loss of information about the r