The third child in a family of nine, Warmack grew up in the Chicago area and had no formal training as an artist, though he began making art objects in his childhood.
"[3] The incident spurred Warmack to renew his focus on art and broaden his scope, and shortly after he began using the name Mr.
Imagination worked extensively in sculptures carved from industrial sandstone and incorporating thousands of bottlecaps fastened to surfaces of the sculpted objects.
[3] He was commissioned to make an eleven-foot-tall rendition of a Coca-Cola bottle for the 1996 Olympics in Atlanta,[3] a horned dinosaur in the DinoLand U.S.A. section of Disney's Animal Kingdom theme park, and decorated spaces for House of Blues venues in Orlando, Las Vegas, and Chicago.
[4] Among his other major works were a garden installation at the National Botanical Gardens, a globe piece at Ronald Reagan Washington National Airport,[1] and a wall display for the transit building in Winston-Salem, North Carolina.