Many different props, costumes, models of characters, and much more.
Whem working on a film that requires CGI, (computer generated imagery), like the kind used in the HP films to show some of the more fictional characters. It normally takes a model made by hand before an image of the thing can be transfered to the computor to make the figure move. Some models of the HP creatures were avalible to look at inside the exhibit. And pre-recorded sound effects were added below some of the creatures, so that they would make some of the same sounds as they did in the films. At the very end of the exhibit, the exit led everyone straight into a specially designed gift shop, filled with all kinds of HP collectible items, some exclusive collectibles only avalible when you go to the exhibit. And from there, when you left there, it led us straight back to the museum from which we had started in the first place.
This is the coverage of our visit to the Chigago Museum of Science and Industry.