Mixing potions is a new favorite game at our house. I know the glass jars + concrete +bare feet will make a few folks cringe (ahem, Mom) and we usually play with shoes on and in the soft grass to avoid having anything break . But the sound of the wooden spoon mixing water in the glass jars is one of the best parts of the game. It just isn't the same with plastic. We start with a few drops of food coloring in the bottom of the jars, and then I pour water into the jars until Ivo says stop. After that, the mixing and pouring from jar to jar is all his, and will keep him busy for a long, long time. Sometimes he likes to play the jars like a xylophone and it really does sound like music. And I can hear him tapping out different rhythms and experimenting with varying amounts of water in the jars. He's learning a lot, and it's way cheaper than a piano. So cheers to that!