"Looks like a bunch of dinosaur bones" might be the typical reaction to this group of playground sculpture. As a matter of fact, the inspiration did come from dinosaur bones at the Field Museum in Chicago. The sculptures fascinate kids as well as adults and entice young people into creative group activities. The technique differs in several ways from that used in building ferro-cement boars although in many ways it is the same. It utilizes thinner metal supports, three-fourths of an inch U-shaped channel iron instead of expanded of three-fourths on an inch pipe, one or two layers of expanded metal lath instead of eight layers of wire mesh, and much more mortar. Some of the shell has a thickness recommended for ferro-cement boats 60 feet long. It requires a lot of modeling of the fresh mortar which is applied in three separate layers, each of which is allowed to set and then cure for one full day. With each layer the workmen gradually fills in depressions, rounds out contours and, when the concrete has become hard enough, scrapes off rough edges to make the object look like a piece of sculpture. Because the entire framework is welded, and support bars are placed in specific areas to stop any movement in the framework, there is sufficient strength so that mortar need be applied only to the outside of the structure. If, however, one were to build a very high sculpture or even a house it would be necessary to apply mortar to the inside for additional strength. A large structure could even be insulated on the interior with an insulating concrete or sprayed polyurethane foam, then coated with a thin layer of portland cement plaster or mortar containing alkali-resistant fiberglass.