Here is a picture of an interesting wall constructed at Algonquin College in Perth Ontario where John Scott teaches. The curvy cedar wall...4' high with 16" wide copes was completed last month by students taking an ever-expanding-in-scope masonry heritage course taught by John Scott. John writes...The cedar is laid like a coverband under the heavy copes. The weight of the copes compress the cedar against each other and, to some extent, to the contour of the lower stone, forming a perfect grip. Although the cedar is organic, the overhang of the copes keep it dry allowing it to survive many years. Similar walls around the Merrickville, Ontario area combine limestone and cear throughs and rails that date back to 1880 (?) and the cedar components, that although ancient and dry, are still intact.