The Heidelberg Project is an outdoor art project in Detroit, Michigan. It was created in 1986 by artist Tyree Guyton and his grandfather Sam Mackey ("Grandpa Sam") as an outdoor art environment in the McDougall-Hunt neighborhood on the city's east side, just north of the city's historically African-American Black Bottom area. The Heidelberg Project is in part a political protest, as Tyree Guyton's childhood neighborhood began to deteriorate after the 1967 riots. Guyton described coming back to Heidelberg Street after serving in the Army; he was astonished to see that the surrounding neighborhood looked as if "a bomb went off". - Source: Wikipedia