What started as an artists sketch four decades ago has now become a working product. In 1970 artist Robert Smithson, perhaps best known for his ‘Spiral Jetty’ earthwork, created a sketch showing a tugboat towing a vegetated island on a river and called it “Floating Island“. During his lifetime he was never able to see the idea realized, but in 2005 a team was able to create the island and it toured the shores of Manhattan. There’s a great multimedia feature from the NY Times about the construction of the piece. The islands 30′ by 90′ surface had ten trees, several large rocks, shrubs and turf over bales of hay and soil.