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</a> The vines are grown hydroponically, their roots soaking up nutrient-enriched water from raised troughs filled with rock wool – a material derived from basalt that resembles loft insulation. Their intake of nutrients such as potassium, nitrogen, calcium, iron and magnesium is measured and adjusted weekly. The ambient temperature is controlled to within a tenth of a degree. In fact everything is computer-controlled – water content, humidity, irrigation. A weather detection system on the roof measures the outside temperature, the intensity of the sunlight, the wind speed and direction, and adjusts the system of vents and blinds accordingly.