During the summer of 2006, Jacksonville Main Street hosted a group of professional sign painters called Letterheads to conceive and execute heritage-based art projects throughout Jacksonville's historic central business district. The result was a collection of murals and sign projects that highlight the rich history of Jacksonville. The event, which a celebration of the arts and history, was dubbed "The Jacksonville Walldog Extravaganza." A Walldog was originally a sign painter who traveled throughout the country painting advertising on buildings in the early 20th century. Today, a Walldog is a nickname referring to the Letterhead sign painter who create murals in a similar manner.