What type of sculpture is used in Watts Towers?

Watts Towers is primarily composed of assemblage sculpture, which involves creating art from a variety of found objects and materials. Constructed by Simon Rodia over 33 years, the towers are made from steel, mortar, and a mosaic of tiles, glass, and ceramics. The whimsical and intricate designs reflect both cultural influences and personal expression, making it a unique example of folk art in the form of monumental sculpture.