One of the best ways to advertise your restaurant is by having people actually see all the yummy, delicious dishes you're cooking up. After all, there's a popular saying in the culinary world that says that before tasting anything, we eat with our eyes. Unfortunately, you can't use real food because it'll start to rot which is most definitely NOT appetizing. Most restaurants use photos, but in many parts of Asia (Japan in particular), they prefer using wax versions of each dish instead.
The small Japanese city of Gujo Hachiman in the Gifu prefecture has traditionally been the place where most wax foods in Japan are made. Gujo came into prominence in the early 1920s, when the trend for wax food really took off. The artists there are insanely talented at making just about anything you can think of, as this video shows. Although the factories still make wax food for restaurants around the county, these days Gujo Hachiman is more of a tourist destination.