The brain is a truly fascinating structure! It controls the body and allows everyone to think, learn, speak, move, feel, remember, and experience emotions. Although the brain is a single organ, it is very complex and has several regions, each having a specific function. These functionally diverse regions work together to allow for coordination of behavior. This article discusses the "Build-a-Brain Project" wherein students design and model the brain of an imaginary animal. The lesson presented in this article uses easily identifiable characteristics, such as proportion of brain to body mass, relative size of specific brain structures, complexity of cerebrum and cerebellum, and differential development of the frontal cortex. The depth and breadth of the science content can be easily varied to meet the needs and abilities of a wide range of participants. This project can be conducted in one hour, including the time to review the major brain structures. Students should be given approximately 15 minutes to design and build their brains and time should be allotted for their presentations. This project fits in well with a life science curriculum and contributes to a visual arts curriculum. (Contains 2 figures and lists 4 online resources.)