“Closed-ended” toys are great to teach play to children who do not display imaginative play, to increase appropriate leisure time. Make sure that the visual and fine motor skills are sufficiently developed for the task, then teach and reinforce finishing. Gradually add more pieces to increase duration. There is chance that intrinsic reinforcement might occur, that is, the child may learn to play for the pleasure of playing. And even if not, the child will be engaged in age-appropriate leisure activity through which they practice other skills (such as visual and motor, maybe imitation too), and this may set the stage for imaginative play too.
