The work tends to defy formal analysis because one chair can be substituted for another chair, rendering the photograph and the chair photographed elusive to description. Nevertheless, the particular chair and its accompanying photograph lend themselves to formal analysis. There are many chairs in the world; thus only those actually used can be described. Those chairs not used would not be analyzed. The enlarged dictionary definition of the word chair is also open to formal analysis, as is the diagram containing instructions of the work.