A model is much better than a drawing for showing a client how the design of a dry stone feature will look.
I submitted this plasticine model for a judged public art commission a while back. I was not only able to determine better how to build it, based on making a maquette first, it enabled me to get the concept across perfectly to the judges, and as it turned out, I was awarded the work of creating a large dry stone installation ( albeit a different one than the original sail boat design) at the site of the new Northumberland Headquarters Building in Cobourg Ontario.
