A plaster cast is a copy made in plaster of another 3-dimensional form. The original from which the cast is taken may be a sculpture, building, a face, a pregnant belly, a fossil or other remains such as fresh or fossilised footprints – particularly in palaeontology.
Plaster cast bust of George Washington by Jean-Antoine Houdon based on a life mask cast in 1786.
Face casting process, with plastered bandage
The West Court of the Cast Courts of the Victoria and Albert Museum
A death mask is a likeness of a person's face after their death, usually made by taking a cast or impression from the corpse. Death masks may be mementos of the dead or be used for creation of portraits.
The death mask of 18th century sailor Richard Parker
Golden funeral mask of Tutankhamun
Posthumous portrait bust of Henry VII of England by Pietro Torrigiano, supposedly made using his death mask
Bronze death mask of Napoleon