Sumptuous swimming pools; AfriCOBRA’s black power art

Summer in Southern California means swimming pools, and those glittering havens from the heat are celebrated in the new book “Splash: The Art of the Swimming Pool,” a collaboration between photographer Tim Street-Porter and his wife, the designer and writer Annie Kelly.  Plus, we meet two artists from AfriCOBRA, a Chicago-based collective formed in the late 1960s that made art to empower black communities. Their work is part of the blockbuster show “Soul of a Nation: Art in the Age of Black Power 1963-1983” at The Broad.