When my children were in their early teens, I read them Jostein Gaarder's wonderful book, Sophie's World. It told the evolution of philosophy in an engaging narrative. It's a wonderful book. Years later, Richard Linklater made Waking Life - a video that will be looked back on in 30 years as ground breaking in so many ways. It delves into similar subjects as Sophie's World. Both have an Alice in Wonderland quality to them, illustrating as they do the otherworldly nature of other world views. Here is an excerpt from it.