[1] His practice is founded on extensive field research and incorporates discourses on art, cultural geography, ecology and the repurposing of the landscape genre, traditionally associated with painting, into sculptural statements.

[8] De St. Croix's depopulated small-scale model of the topography and fence-architecture of the demilitarized zone between North and South Korea observes the success of the structure and barrier[9] while reflecting on the constructed and artificial nature of borders.

[10] Rooted in research done in West Virginia where he met the anti-mining environmental activist Larry Gibson,[11] the monumental sculptural installation Mountain Strip, over forty feet long and twenty-two feet high, reconstructed topography of a section of the strip-mined Kayford Mountain Ridge top in West Virginia.

[12] De St. Croix's 80 ft long sculpture Broken Landscape II depicts a section of the U.S.-Mexico border in Eagle Pass, Texas.

[13] The art critic Jerry Saltz wrote that "Lovingly detailed with hills, rocks, trees, and (of course) fencing, it expresses the desolation, desperation, and absurdity of trying to wall off one country from another.

[8] The art historian Tami Katz-Freiman said of the sculpture that "The fragment of earth that appears in this work contains the scorched remains of plants and a pond of water.

These natural vestiges seem to have been uprooted from the Sawgrass Plains in the aftermath of an ecological disaster, in order to be preserved in the museum as the last remains of a vanished world.

[21] Moving Landscpe II is part of the Gem State exhibition at the Sun Valley Museum of Art where De St. Croix participated in a residency in the fall of 2019.

Using techniques including model-making, theater, and special effects, De St. Croix combines recycled styrofoam with eco-resins and other earth-friendly materials to model the surface of Hollow Ground.