Mantegna's most famous work is the interior decoration of the Camera degli Sposi in the Ducal palace, Mantua, dated about 1470. The walls are frescoed with scenes of the life of the Gonzaga family, talking, greeting a younger son and his tutor on their return from Rome, preparing for a hunt and other such scenes that make no obvious reference to matters historic, literary, philosophic or religious. They are remarkable for simply being about family life. The one concession is the scattering of jolly winged putti, who hold up plaques and garlands and clamber on the illusionistic pierced balustrade that surrounds a "trompe-l'œil" view of the sky that decks the ceiling of the chamber. Mantegna's main legacy in considered the introduction of spatial illusionism, carried out by a mastery of perspective, both in frescoes and in "sacra conversazione" paintings: his tradition of ceiling decoration was followed for almost three centuries.