Six of them are unfinished four Prisoners (a.k.a.The Slaves), St. Matthew, and a Piet?  each a fascinating revelation of how Michelangelo released their power from the marble.
All of them were finished by Michelangelo.
mnli hypothesis: All of them were finished by Michelangelo. premise: Six of them are unfinished four Prisoners (a.k.a.The Slaves), St. Matthew, and a Piet?  each a fascinating revelation of how Michelangelo released their power from the marble.