Mia and Claire are 3-year-olds at free play in their preschool. Mia has a lacy apron tied around her head like a wedding veil, and Claire has a sheer curtain tied over her shoulders like a cape. Each is holding a wand—one is a stick with a star on the end, and the other is a long Tinker Toy stick with one wheel connector at the end. When asked what they're doing, Mia says, "We're playing fairy. We're both fairies." What kind of play are they engaging in?