Sure! It's from the Willamette Valley Dream Survey in Portland, Oregon (look it up if you haven't heard of it). c: Portland is my hometown, and I remember seeing the flyers for the survey and thinking they were so interesting! They became an urban legend around here, and I've always been interested in them, so eventually I started coming up with a story that's sort of based on them 😁
I had relatives in Portland, and saw those same posters when I visited them. That's exactly what I wondered about - I'm working on a novel based on those posters, but I went a completely different direction with it 👍