Galindo's "zapatello" uses gears and cranks to hit a shoe and glove on a drum made of a tire and rawhide. Richard Misrach/Fraenkel Gallery, San Francisco, Pace/MacGill Gallery, New York and Marc Selwyn Fine Art, Los Angeles hide caption

itoggle caption Richard Misrach/Fraenkel Gallery, San Francisco, Pace/MacGill Gallery, New York and Marc Selwyn Fine Art, Los Angeles

Some businesses in Ferguson have boarded up their windows in anticipation of the grand jury announcement whether to criminally charge Officer Darren Wilson in the killing of 18-year-old Michael Brown. Jeff Roberson/AP hide caption

itoggle caption Jeff Roberson/AP

President Obama after discussing his executive actions on immigration Friday at Del Sol High School in Las Vegas. Business groups say the plan does little to help U.S. employers attract foreign workers. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP