Honestly, would we still hold this opinion if we hadn't already invested attention in this hierarchy? Let's forget what we've already put into the idea that fiction is the primary source; with fresh eyes, a guide can be the first spark. Many of my friends don't watch movies, but a guide on summer festivals or youth hostels in Europe inspires them. For example, a guide to Christmas markets in Belgium could alone arouse the desire to travel, with no fiction involved.