Here is a collaborative book that I just finished! It is meant to be interesting for all age ranges. For young children there is a story about a Fish and Parrot, for young adults there are science facts relevant to the story, and for adults there are philosophical thoughts on the subconscious.
You can download the high resolution version of it! It is 90 Mb! So it may take some time. Below you can scroll through the book, however because of the large file size, it may take some time for you to see it.