The "Four Spirits" sculpture was unveiled at Kelly Ingram Park on September, 2013 to commemorate the 50th anniversary of the 16th Street Baptist Church bombing. Crafted in Berkeley, California by Birmingham-born sculptor Elizabeth MacQueen and designed as a memorial to the four girls killed in the bombing (which occurred on September 15, 1963), it depicts the four girls in preparation for the church sermon at the 16th Street Baptist Church in the moments immediately before the explosion. The youngest girl killed in the explosion (Carol Denise McNair) is depicted releasing six doves into the air as she stands tiptoed and barefooted upon a bench as another barefooted girl (Addie Mae Collins) is depicted kneeling upon the bench, affixing a dress sash to McNair; a third girl (Cynthia Wesley) is depicted sitting upon the bench alongside McNair and Collins with a book in her lap. The book depicts the refrain of William Butler Yeats poem "The Stolen Child". The fourth girl (Carole Robertson) is depicted standing and smiling as she motions the other three girls to attend their church sermon. At the base of the sculpture is an inscription of the name of the sermon the four girls were to attend prior to the bombing—"A Love that Forgives." Oval photographs and brief biographies of the four girls killed in the explosion, the most seriously injured survivor (Sarah Collins), and the two teenage boys shot to death later that day also adorn the base of the sculpture.