Welcome to the world of Mr. Kim Kyo-chul and his “Tin Taxi.” From the outside, the taxi is an inconspicuous white, like many other taxis in Seoul. Inside, it’s an explosion of silver. Thousands of cans cover the surface: Can bottoms line the ceiling and walls, strings of can openers are draped on the seats, and can leaves and flowers hang from the ceiling. There are even shaking head dolls made out of cans, and ornaments stuck to the steering wheel.