Shopping for locally grown produce has never been easier for some shoppers in Germany. At the Metro supermarket in Berlin, an indoor farming startup has set up a vertical farm at the end of the store’s produce aisle, inside which greens and herbs are growing. The farm takes the form of a glowing modular box, which is so efficient it can make vertical farming affordable on a micro scale. Within the box, plant’s don’t grow on soil, but instead grow “hydroponically” on a thin layer of water enriched with fertilizers and oxygen, under LED growing lights which imitate sunlight.