Bourne’s visual heft makes a statement. A very thick pane of glass, etched with a concave divot on its back and clear with a convex mound on its front, is mounted to a canopy or floating backplate, making for a mood-enhancing light diffusion.,Bourne’s visual heft makes a statement. A very thick pane of glass, etched with a concave divot on its back and clear with a convex mound on its front, is mounted to a canopy or floating backplate, making for a mood-enhancing light diffusion.