At three and four, the task of riding a wooden horse is still a challenge, but apparently a manageable one, inflating the rider to his full extent with demon strations of capacity. Parents need no longer ride alongside to protect their youngsters. The rider throws himself into the role in a serious way, playing it with verve and an admitted engagement of all his faculties. Passing his parents at each turn, the rider carefully lets go one of his hands and grimly waves a smile or a kiss-this, incidentally, being an example of an act that is a typical part of the role but hardly an obligatory feature of it. Here, then, doing is being, and what was designated as a "playing a t " is stamped with serious realization.