Original drawing entitled “Curious Black Substance” copyright © 2016 Alan M. Clark. Size: 11”x16”. Medium: Colored pencil on gray/green paper. Comes mounted in a black mat in a maple wood frame approximately 18”x24”. Click on the other image to see it in its frame hanging on the wall. Interior illustration for the The Mountain and the Vortex by Stephen Vessels – Muse Harbor Publishing.