Even in the modern era, Japan's stationery industry is a source of fast-paced innovation, with thousands of products hitting the shelves each year. We visit a stationery fair to see how companies target certain sectors of the market, with items like masking tape and novelty sticky notes. Then we take an in-depth look at an invention which swept the globe: erasable pens. Finally, we meet a maker of traditional writing brushes, to learn how they're using classic techniques in surprising new ways.