SANTA BARBARA — A day before the opening of The Architecture of Collage: Marshall Brown a group of museum patrons gathered in the Family Resource Center of the Santa Barbara Museum of Art where Brown — a trim, bespectacled Princeton professor — was on hand to walk them through his collage process. While snipping through stacks of photocopies, which included photos of iconic structures designed by Mies van der Rohe, Louis Sullivan, Eero Saarinen, and others, Brown and the workshop’s participants traded ideas. When one woman offered her thoughts on using musical analogies when arranging collage elements Brown was immediately interested: “That’s good: I might steal that …” he quipped.