Gallagher uses combinations of painting, video, sound, drawing, and sculpture to express a single topic, with examples ranging from attempts to prove the existence of miracles to the phenomenon of New Year's resolutions. For the ICA, Gallagher presents Unknown Source, a new series of related works inspired by "The Cloud of Unknowing," an anonymous 14th-century Christian text that offers a roadmap toward knowledge of self and deity. Included will be a video of people dowsing and praying; a large-scale installation of fresh flowers that depict sky and clouds; landscape paintings created out of smoke; and an arrangement of sound-emitting flowers. Gallagher earned a Master of Fine Arts from the School of the Museum of Fine Arts, Boston, in 1996. She is Assistant Professor in Fine Art at Boston College.