The Sea Tower is a simple but very stable marine structure derived from the example of the FLIP research vessel launched in 1962 and in use to the present day. It is what is technically known as a ‘spar’ or pylon buoy structure that is self-stable in open sea conditions by virtue of having a large proportion of this vertical structure underwater and ballasted to achieve a state of near-neutral buoyancy. Thus instead of reacting to surface waves as a boat, it remains stable and waves pass around it. They are potentially the smallest scale structures that are self-stable in open sea conditions. Though little explored today except for very large mobile oil rigs, these simple structures have innumerable applications and can be potentially fashioned in many ways. Some may be based on modular or