Grow amazing marbles right before your eyes. Add water and watch the colored marbles grow. Watch them expand into stunning, bouncy translucent spheres Marbles can dry to their original size and shape when removed from water. Grow them over and over again. Detailed instructions are included. Features include: •Add water and watch the colored marbles grow •Watch them expand into stunning, bouncy translucent spheres •Marbles can dry to their original size and shape when removed from water •Grow them over and over again •Detailed instructions