Aldo Castillo is a Chicago artist and gallery owner who decided to formulate a response to war. Not just the present war in Iraq, but all war in general. A native of Nicaragua, Castillo holds strong feelings of the U.S.-backed interventions in his homeland. All of these feelings led to the creation of "Art at War -- the Artist's Voice," an exhibit of approximately 120 paintings and sculptures by nearly 100 artists from 23 countries, opening this Saturday, the anniversary of the 9/11 attacks, at the Aldo Castillo Gallery (233 W. Huron). The exhibit runs through October 16th.