This class comprises physical features that are purposely created by human activity, such as scratches, artificial caves, artificial water channels, etc. In particular, it includes the information encoding features on mechanical or digital carriers.
the Manchester Ship Canal (Farnie, 1980)
Michael Jackson’s nose following plastic surgery
the laser-readable “pits” engraved June 2014 on Martin Doerr’s CD-R, copying songs of Edith Piaf.