Columbia University [Professor working with bright light.]

Columbia University [Person holding a bright light.]

Columbia University [Person holding a bright light.]

Columbia University [Man holding a bright light.]

Columbia University [Science professor performing an experiment.]

Columbia University [Science professor performing an experiment.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Professor talking with student.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Science professor.]

Columbia University [Sculpture professor.]

Columbia University [Three professors.]

Columbia University [Science professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]