Children's "play," as the expression is commonly understood, differs from the sportive movements of fancy considered in the last chapter by its essentially active character. We do not speak of a child playing save when he does something, however slight, by way of expressing or acting out a fancy. This outer expression of fancy in some active form is commonly called by children themselves "pretending" to be or to do something, by older people when looking back on the pretence "making-believe". In order to understand what childish fancy is like, and how it works, we must carefully watch it as it moves among the toys and creates a new play-world. _The Young Pretender._ Child's play is a kind of creation of a make-believe but half-real world. As such, it has its primal source in the impulse to act out and embody in sensible form some interesting idea; in which respect, as we shall see by-and-by, it has a close kinship to what we call art. The image, say of the wood, of the chivalrous highwayman, or what not, holds the child's brain, and everything has to accommodate itself to the mastering force. Now since play is the acting out of some interesting and exciting fancy, it comes at once into collision with the child's actual surroundings. Here, however, he finds his opportunity. The floor of the room is magically transformed into a prairie, a sea, or other locality, the hidden space under the table becomes a robber's cave, a chair serves as horse, ship, or other vehicle, to suit the exigencies of the particular play. The passion for play is essentially active; it is the wild longing to act a part; it is thus in a way dramatic. The child-adventurer as he personates Robinson Crusoe or other hero becomes another being. And in stepping, so to say, out of his every-day self he has to step out of his every-day world. Hence the transformation of his surroundings by what has been called the "alchemy of imagination". Even a sick child confined to his bed will, as Mr. Stevenson tells us in his pretty child's song, "The Land of Counterpane," make these transformations of his surroundings:-- And sometimes for an hour or so I watched my leaden soldiers go, With different uniforms and drills, Among the bed-clothes through the hills; And sometimes sent my ships in fleets, All up and down among the sheets; Or brought my trees and houses out, And planted cities all about.