The nuraghe Sisini is located near the homonymous hamlet of Senorbì. The linguist Salvatore Dedola derives its name from She Sinay, “that of Sinai,” an ancient divine title of Yahwé, which others associate with the Sumerian lunar god Sin. The monument can certainly be considered a “unicum” in the landscape of island megalithism, especially for its original planimetric profile. It is one of the many testimonies of past times that has so far survived, in dignified solitude, the indifference of men, rising in the middle of a vast plain that gently slopes down the soft slopes of the surrounding hills of Trexenta. If we look around, the impression is that of being inside a gigantic puzzle, among a myriad of stones with strange shapes, some of which bear marks that we imagine were left by ancient stonecutters; and we like to think that it is the solitary nuraghe that guides the game, challenging us to uncover the secrets of its mysterious past. The photos of the nuraghe Sisini are by: Bibi Pinna, Marco Cocco, Francesca Cossu, Nicola Barbicha Tornello, and Sergio Melis.