Argentinian artist Tomás Saraceno's studio is two big and old industrial units covered in graffiti, in what was East Berlin. This was where the company AGFA developed and made the chemicals that made colour photography possible. The ground is so polluted Saraceno's lease forbids him from growing any vegetables, and this matters to this environmentally concerned artist. But the industrial past of Studio Saracen is fitting as Tomás’ work is highly technical. Here he has an architecture department, an arachnid research laboratory and an engineering works. He has about 40 people working on different projects. Tomás talks to Julian May about some of his projects, including Aerocene - sculptural hot air balloons that ascend and fly without the use of any fossil fuels, by capturing the reflected heat of the sun. His ambition is to create a kind of slow aviation, in which his balloons circumnavigate the globe on air currents.

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