Artist Chauncey Flay creates his artworks from a stone that is normally used for roadworks and railway lines.
Flay creates sculptures from greywacke, a hard, grey sandstone not often seen inside art galleries.
He takes a large chunk of the rock and uses a diamond polishing tool to transform parts of it into glossy, sharp-edged shapes.
“Greywacke is a very low grade, low value product,’’ he said.
“That is one of the main things I find interesting. I usually work with materials that people don’t attribute any value to.