The pictures provide a frame for the stories. The "right" arrow and the "down" arrow each provide a loop through all the pictures.
As pages are added, clicking on the arrow pointing "down" will take you to more and more detailed stories. Also poetry and other reflections. Keep clicking "down" and eventually you'll get to the next picture, and so on. The "pickup truck" icon takes you on the same track as the "down" arrow, giving a tour of all pictures and stories.
The "right" arrow skips the stories. Clicking to the "right" will bring you directly to the next picture with its brief caption.