Koh’s work encompasses the artistic styles of conceptual art, environmental art, and minimalism. In an on-going work titled "Knitwork" (1992-present), Koh unravels used garments and re-knits the materials into one larger and constantly evolving object. This piece demonstrates characteristics of environmental art through Koh’s use of recycled materials and the ways in which she turns used and discarded items into a working piece of art. In a similar artwork called "Lumber" (1991-1994, dispersed 2002), Koh makes use of flexible pieces of recuperated lumber glazed with oil and marine varnish to be installed alongside select architecture. Various projects by Koh are also collaborative or rely on the active participation of its audiences. One example of such works include an art gallery titled “ad hoc gallery” which was put on display in collaboration with Geoffrey Brown from 1993-1994.