I remember having a book like this when I was little, so I started looking for one to use as a birthday present for a boy I nanny for. I wasn't sure what this would end up being like, but I was really excited when it came. The book gives an explanation of all the different types of stereograms it includes, has directions on how to view them, and has pages upon pages of great stereogtams. I think it's going to be a huge hit with this 10 yr. old boy, and I can't wait to share something that was so much fun for me as a kid with a whole new generation. I highly recommend it as a gift for those hard-to-buy-for kids!