It has been said that you can tell the men from the boys by the size of their toys. This is especially true in the burgeoning uses of cast-in-place concrete, shotcrete, ferrocement and portland cement plaster for recreational pursuits. Many esthetically pleasing and innovative objects can be produced right on the site where they are to be used and enjoyed. At times the "players" can add a bonus to their actually creating and building something of relative permanence for ongoing recreational use. Direct participation of the people involved can reduce the cost of labor, and the basic materials- cement, aggregate, and reinforcement- are readily available at reasonable cost. A fine example to cast-in-place design that invites one to participate directly rather than simply observe is the Forecourt Fountain in Portland, Oregon, designed by Lawrence Halprin. Water cascades over a series of tiered concrete monoliths to a pool below which is edged with overlapping concrete plates. Stairs descend on both sides to the lower pool level. One may wade either above or below just as one might near a real waterfall. Of course, this project is monumental in scale, covering an entire city block, but an individual could construct a miniversion in his own back yard, where the sound and beauty of water flowing into a small concrete pool could enhance the garden or patio. Another perhaps more ambitious project is constructing a children's playhouse. One can let the imagination run free and conjure up a miniature castle, a small dome, a pirate ship, an A-frame or just a segmented free form with several rooms connected by tunnels. These shapes can be built with bent channel and expanded metal lath covered with shotcrete or plastered with mortar. The beauty of the plastering method is that the kids can get right in there and help. Some Canadians have played around with concrete for winter sports. In March 1975 seven teams of tobogganists careened down the Canyon Ski Lodge slopes at Red Deer, Alberta, in concrete toboggans. The winning entry reached an estimated speed of 31 miles per hour at the finish line, covering the 400 foot course in the fastest elapsed time of 12.87 seconds.