The lid comes off and a small prehistoric world comes out: two colors of cloud clay, a scoop of colored gravel and two dinosaur figures that fit in a fist. Cloud clay is the light, stretchy kind that never dries out, so a child can raise a hill, bury a stegosaurus, flatten the lot and start again next week. Press the gravel through it and the clay stops reading as clay and starts reading as ground.

Everything goes back in the jar when play is over, and the jar is only 3.25 inches across, which is the whole reason this line exists. It rides in a bag to a restaurant, a waiting room or the back seat, and it comes home again with nothing lost. Creativity for Kids, a Faber-Castell company, recommends it for ages 3 and up.