While Ell and I put together O's adirondack chairs and table this morning (a birthday gift for O from my sister and niece), O had a great time taking the sockets out of the tool box. She lined them up according to size, but she got really frustrated when she tried to put them back into the box. I think this will make a great Montessori work when she is older. I'll take all of the tools out of the box, put them in a basket, and show her how to fit them into the correct places one by one. Fun!