Featured images Charles Ross: The Substance of Light Nov 12, 1976 – Jan 2, 1977 Featured images Installation view, Charles Ross: The Substance of Light, MCA Chicago Photo © MCA Chicago Installation view, Charles Ross: The Substance of Light, MCA Chicago Photo © MCA Chicago Installation view, Charles Ross: The Substance of Light, MCA Chicago Photo © MCA Chicago Installation view, Charles Ross: The Substance of Light, MCA Chicago Photo © MCA Chicago Installation view, Charles Ross: The Substance of Light, MCA Chicago Photo © MCA Chicago Installation view, Charles Ross: The Substance of Light, MCA Chicago Photo © MCA Chicago