Nienhuis 3D Object Fitting exercise. By eight or nine months, an infant can explore putting a wooden egg in a cup and taking it out again. Putting a ball in a cup is a new experience, because the child has to turn over the cup to remove the ball. Putting a cube in a box is even more challenging because it is necessary to line up the corners of the box and cube for success. These activities enhance hand-eye coordination and give the infant an opportunity for his two hands to work together in a meaningful way. Includes: 2 cups, 1 egg, 1 ball, 1 cube and 1 tray for material presentation and storage.