Waddell spent the early 1960s in Mexico , continuing to create new works and studying the casting process . In September 1963 a bomb exploded in a church in Birmingham , Alabama , killing four young girls . This prompted Waddell to create '' That Which Might Have Been : Birmingham 1963 '' , a work that was set up at the First Unitarian Universalist Church in Phoenix in 1969 . A second casting was later installed at the Carver Museum and Cultural Center in Phoenix
a bomb exploded
16th Street Baptist Church bombing
John Henry Waddell