home as of 2021. Having provided both an experimental testbed for New Alchemy's ideas, and a sustainable home for two of its founding members for over 15 years, the Cape Cod Ark has been referred to as "New Alchemy’s crowning achievement". The Prince Edward Island Ark In 1974 Todd returned to Canada to design and build "An ARK for P.E.I." at Spry Point, Kings County on Prince Edward Island, with financial support from the federal and provincial governments. Completed by David Bergmark and Ole Hammarlund of Solsearch Architects and the New Alchemy Institute, the Ark gained national attention. It was officially opened by Prime Minister Pierre Trudeau on September 21, 1976. The Ark was an attempt to re-examine the relationship between people and nature. It also gave the New Alchemists an opportunity to test their ideas in a very cold climate. Differing expectations about the project caused difficulties. Because the experimental nature of the Ark had been de-emphasized, the technological problems that occurred became particularly embarrassing. Also, many Canadians expected the publicly funded installation to be viewable as a demonstration project for renewable energy and sustainable living. In contrast, the New Alchemists onsite saw it as a private research installation and tried to discourage visitors. In 1977, New Alchemists David Bergmark and Nancy Willis moved out, ending the experiment in sustainable living. The Ark was supervised for two more years by Ken MacKay, a biologist hired by the provincial government's Institute of Man and Resources (IMR), and then closed in 1981. Nonetheless, the Ark was an important test bed for many of the principles that were later applied to "living machines", as well as a number of trail-blazing and now established green or sustainable technologies: solar orientation, solar collectors, wind energy, thermal energy storage, and composting toilets. Historian Henry Trim emphasizes the Ark's impact on Canadian culture, helping "to introduce Canadians to renewable energy and organic foods as well as pioneering green architecture, aquaponics, and sustainable farming." Although it was demolished in 2000, the Ark has been called one of "Prince Edward Island’ s two most iconic works of modern architecture". In 2016, it was commemorated in the exhibit Living lightly on the earth: building an Ark for Prince Edward Island, 1974-76 at the Confederation Centre of the Arts in Charlottetown, P.E.I. Harwich, Massachusetts In 1988, the town of Harwich, Massachusetts hosted a four-month pilot of one of Todd's lagoon