sentences:  After he was found it was learned that Ricetti had used the traditional artisan skill of dry stone walling, which he had learned during his apprenticeship in his North Italian homeland, creating what he referred to as his Garden of Eden.Ricetti's work, completed totally on his own, covers 160,000 square metres of rocky ridge atop Scenic Hill, using the natural landscape and materials found in the area to create a hermitage that stretched for over a kilometre.With the arrival of World War II state authorities put in place the requirement for enemy aliens to register under the National Security (Aliens Control) Regulations, report to the local police station each week, and carry an identity card at all times.