Japanese mayonnaise giant Kewpie has a building nearby and we went for a tour recently.
This is not the factory, but the research center and some corporate offices. And the entire first floor is dedicated to this very popular tour, which shows how mayonnaise is made. I think there might have been four or five separate rooms.
One room is even like a mini gaming arcade where some little kids competed in trying to choose the correct ingredients for mayonnaise and putting them on a computer scanner.
At the end of the tour, you are seated in a dining room, given a tiny salad, a bottle of mayo and a number of condiments to mix and match and find your favorite dressing.
The result: you leave wanting to fill your life with this creamy goodness. I honestly decided to stop buying creamy dressings and just mix mayonnaise with something if I really want something creamy.
The tour, which is free and fills up months in advance, is obviously very good marketing.