Chain Reaction is a peace monument and public art sculpture composed of a metal framework of stainless steel and fiberglass surrounded by concrete, depicting a mushroom cloud created by a nuclear explosion. Designed by American editorial cartoonist Paul Conrad and built by Peter M. Carlson, the 5.5-ton, 8-meter (26-foot) high sculpture was installed in 1991 adjacent to the Santa Monica Civic Center in Santa Monica, California.