We can tell that Zane is getting older by how easy it is to build and keep a train track in place. He still tends to pull them apart but these days he’ll also try running a train down the track and even piece the track back together after he’s disassembled it.
As for the books, that’s what he usually reads every day. We fill up the bookshelf and then he’ll sit down and pull them out, usually one at a time, flip through the pages and then move on to the next book. Sometimes he’ll get up and bring a book over for us to read to him or so he can point out the car/truck. Whenever Zane sees a car, truck, or heavy equipment, in a book or on the street, he points and makes motor noises.