Censorship in an image that completely fails to properly conceal the object in question, or is located on the place where there is nothing worth censoring.
Mosaic censoring at such a high resolution that it appeared as uncensored while the image is not zoomed in
A complete lack of censorship is generally frowned on by Japanese publishers due to the self-censorship policy as a result of the Article 175 of the Japanese law forbidding all kind of pornography within Japan, so artists will use techniques seen here in order to avoid confrontation or prosecution.
