A couple weeks ago I watched as Sean rummaged through the recycling bin and pulled out a yogurt container. He carefully placed it right-side-up on the kitchen floor. Then he went back to the bin and pulled out the yogurt container lid. He carefully placed the lid on top of the container, gave me a big smile and started clapping. He was so proud of himself! And, I admit, I was pretty impressed, too. Since then, he’s been regularly matching round lids to cylindrical containers. I finally caught him on video this morning: