Under Japanese law, sexually explicit art and video distributed domestically must obscure genitals, and mosaic censorship refers to the pixelated blur pattern most commonly used to satisfy that requirement. It's typically a lighter, more transparent effect than full censorship, which blacks out or heavily obscures more of the image, and it's absent entirely in uncensored releases. Readers can compare censorship styles by browsing mosaic censorship hentai manga and doujinshi on Top Hentai.