When I started blogging about classic toys, a friend of mine mentioned the ring-stacking toy. I think this is a common one that pops into people's heads when you bring up classic toys. This one is another favorite of Baby Bear's. When he first got this toy, all he wanted to do was pull the rings off. Then, he began stacking the rings in no particular order, which was good for his fine-motor skills. Now, he remembers the order they go in and can place them correctly in just one try. Or, if he does accidentally grab the wrong ring, he notices the gap between rings and fixes it, which has been great for helping him develop critical thinking skills.