Thingiverse's latest addition to its Interactive Art collection is Don Boose's Pearl Slide. This slide is made from six separate 3D printed pieces, assembled and glued together, and five wooden dowels used to hold the slide up. Other additions include three vinyl cuts for the flag poles, and, of course, at least one ball to roll down the slide. This looks like a great project for teaching children how to design an object that moves a ball along! Check it out at http://3dprint.com/111265/3d-printed-pearl-slide/