We found some great books at goodwill. This one is an encyclopedia of how things work with amazing illustrations. The kids were very patient while J was at work and I ran the membership class all day. The kids have this interesting habbit of "painting" books. We have paintbrushes scattered (and frequently lost) all over the house so the kids can paint. I believe we have some artists in progress. Who knows what art concepts they are learning by focusing so intently on the illustrations and how they are put together in nearly every book (thousands!) we bring into our house. I could not have come up with this strategy!