This is an "Altar de Muerto" (Mexican-style Memorial Shrine) in honor of a woman who passed-away recently. Those shrines made during the Dia de Los Muertos (Mexican traditional Day of the Dead celebrations, each year on Nov 2nd).
Photo taken at the Dia de los Muertos procession in the Mission (San Francisco) on Nov 2, 2013.
For more info on this event, please check out my Dia de los Muertos series.