Scala Alla Marinara Dwg =link= Online

They explained that the Scala alla Marinara had been designed centuries ago by an engineer who loved both ships and music. He tuned each stone to the frequencies of the harbor so the stair would resonate during certain tides, opening a passage only when moon and ballast aligned. The DWG was his way of encoding the stair’s secret for those who could read both linework and sea-song.