The Visual and Verbal Communication hierarchy contains terms for works, including images and written documents, having the primary and original function to communicate ideas, concepts, or aesthetic experience through visual, verbal, or performance-based media (e.g., "books," "diptychs," "symphonies (musical works)"). Although almost any artifact can be considered to communicate visually something about its maker, its origin, or its use, this section concerns those items originally produced with the purpose of transmitting an informational, symbolic, or aesthetic message.