That is really interesting, and a great observation. Seems like an engaging way to add to the experience of an exhibit. The conveyor belt observation is spot on.
When I did an exhibit of 8x10 contact prints, people moved right by, usually not getting close enough to really see all that the prints offered.
One thing I did observe (these were every day persons, not familiar with contact printing) was that a few people that leaned closer to see something a bit better, then they would get a funny look on their face and get closer and closer, some with their nose almost on the print, and at that point you would hear them say, very quietly, "Wow."
I would say to Alex to print each the appropriate size, and vary the hangings so as to engage people in the manner you have observed.