Fuente: WIPO "tomato" An artificially illuminated indoor system for intercropping at least one first crop and at least one second crop comprises an inner volume, enclosed by means of two or more opposite wall portions defining an enveloping vertical inner surface. The first and second crops are cultivated within the inner volume. The first crop is cultivated on tray racks whilst the second crop is cultivated on the enveloping vertical inner surface of the two or more wall portions.