We have plastic stacking rings that light up and play sounds. It seemed like a good idea; the toy plays a success song when the task is completed and allows for some visual and auditory stimulus. Except it requires batteries and thus starts the great lifelong task of remembering to change batteries in a million different toys. Next time I am sticking with beautifully made wooden toys that offer much of the same in terms of play but without being a machine. $19.95US at piccolini.