Seasteading is the concept of creating permanent dwellings at sea, called seasteads, in international waters outside the territory claimed by any government. No one has yet created a structure on the high seas that has been recognized as a sovereign state. Proposed structures have included modified cruise ships, refitted oil platforms, and custom-built floating islands. Proponents say seasteads can "provide the means for rapid innovation in voluntary governance and reverse environmental damage to our oceans ... and foster entrepreneurship." Some critics fear seasteads may function more as a refuge for the wealthy to avoid taxes or other obligations. While seasteading gives an impression of freedom from unwanted rules and regulations, the high seas are "some of the most tightly regulated places on Earth" despite appearing borderless and free; in particular the cruise ship industry is highly regulated. The term seasteading is a blend of sea and homesteading, and dates back to the 1960s. Many architects and firms have created designs for floating cities, including Vincent Callebaut, Paolo Soleri and companies such as Shimizu, Ocean Builders and E. Kevin Schopfer. For a dozen years L. Ron Hubbard, founder of the Church of Scientology, and his executive leadership became a maritime-based community named the Sea Organization (Sea Org). Beginning in 1967 with a complement of four ships, the Sea Org spent most of its existence on the high seas, visiting ports around the world for refueling and resupply. In 1975 much of these operations were shifted to land-based locations. Marshall Savage discussed building tethered artificial islands in his 1992 book The Millennial Project: Colonizing the Galaxy in Eight Easy Steps, with several color plates illustrating his ideas. A 1998 essay by Wayne Gramlich attracted the attention of Patri Friedman. The two began working together and posted their first collaborative book online in 2001. Their book explored many aspects of seasteading from waste disposal to flags of convenience.