Ключевые слова: activity, background, ball, bearing, build, childhood, children, colorful, concept, construction, copyspace, creative, creativity, design, development, education, engineering, entertainment, game, kindergarten, kinetic, learn, learning, marble, marble run, maze, motion, navigation, no people, physics, plastic, play, preschool, race, rail, room for text, route, run, stem, toy, track, trail, tube, turn,