Biosphere 2 was a great experiment that drew a lot of public attention and made people aware that perhaps we should look after our resources with a little more care. I would be very interested to learn more about how you are designing an autarkic ‘ocean sphere’. I have a personal interest because I represent a non profit foundation that is member of a European space research program MELiSSA. the consortium works on close life support systems and it is my passion to apply this on Earth. We obviously did a lot of work on algae and artificial lighting. I just love the idea of autarkic floating cities!