His practice spanned a broad range of media including steel, bronze, wood, watercolor, ink, paper, graphite drawings, acrylic paintings, glass and ceramics.
"[2]: 35 Influenced by musicians John Cage and Steve Reich, concrete texts by Emmett Williams and Ian Hamilton Finlay, and the aleatory works of poet Jackson MacLow, his focus shifted in the 1970s into creating video and performance art.
[2]: 35 The tape, picking up dust and debris from the floorboards, made "appaling sounds upon reaching the heads of the machines—sounds recorded and added to and played back by each machine in a building crescendo of unbearable ambient magnitude.
'[11] Ten steel plates, cut and folded in geometric shapes, hung from the walls, each with a thin metal rod welded to it.
According to Jeff Kelley, the piece looked like a 'futuristic sailing device' that made "twitching, crusty, distant metallic sound... from an apparatus designed to catch and register the ambient wind and river currents."
Morrison achieved this effect through wind passing through perforations in iron plates as well as fishing lines that ran from the riverbed to the sculptures armature and tugged on the work, ringing it "as if a bell.
"[12] In 1986, Morrison completed a large sculpture and sound installation, Tongues: The Half-Life of Morphine, for the Center for Research in Contemporary Art in Arlington, Texas.
"[2]: 37 Like earlier pieces, wires rest on the pillows and "jitter nervously" through the sculptures with sounds generated by a synthesizer out of sight in another room.
The name comes from a chant that Jean-Paul Marat's followers intoned as they sat under the heart of their assassinated revolutionary leader suspended in an urn from the ceiling of their meeting place.
In homage to his artistic legacy (via evocations of cubism via Pablo Picasso, surrealism via Duchamp, and the social sculpture of Joseph Beuys), the piece evokes Morrison's "personal art history codified, filtered, and serialized" with the artist's characteristic sound, a "raspy chatter" from steel wires in the shelves that "picks up random martial cadences every minute or so.