A set of three regular deltahedra (triangle-faced polyhedra – tetrahedron, octahedron, and icosahedron), each made from a folded , solid piece of steel and treated with dye oxide. The wooden bases are filled with coal slag, a material that looks like iridescent black sand.

Some edges are left slightly open to emphasize that the pieces were folded together and not separate affixed pieces.

Leaving this gap allows for some of the coal slag to be placed inside the objects, giving the appearance that they have leaked the powder they rest on.

The continuous “line” that goes all around each piece is one of the features of a surface-tiling curve.

The midsphere radius of all three pieces is 7.5″. I always get a kick out of listing midsphere radius in dimensions for art pieces; no one ever questions it. Larger versions can be viewed by clicking on the images.

Treating steel with dye oxide allows for a controlled oxidation process, meaning that it can be stopped (or at least slowed way down) when the desired look is achieved.

Here you can see the scoring along the folds as well as the geometry for the “lines.” The tiny break in the lines physically hold the piece together. Otherwise, it would fall apart into two mirrored pieces as an object sliced by a curve. (These would actually look more like this sliced tetrahedron.)