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There's a shimmer in the glass roof as the wind gusts. You are inside a 2.8m glass cube, a four by four grid on all sides and the roof, with a quarrytiled concrete base.And it is tied back to the house. So what is happening? And then you work it out. It is rainwater just lying there in the 16 glass squares of the dead-flat roof which have been ruffled by a passing breeze.