Silvestri's artworks on praying: gestures and symbols of meditation as well as the key Christian prayer, the Our Father/ Pater Noster. In his book Le Ore e gli Oranti (Worship Hours), Silvestri's icons illustrate and meditate the liturgy of the hours as well as the writings of contemporary poets Maria Caterina and Lilia Grazie Tiberi (year of publication 1999/2000 approximately).