Castrovalva (M. C. Escher)
Castrovalva is a lithograph print by the Dutch artist M. C. Escher which was first printed in February, 1930.
It depicts a city at the top of a sheer slope. The perspective seems to be from lower on the slope, near but not on a narrow trail which skirts along the ridge. In the foreground, at the side of the trail there are several flowering plants, grasses, ferns, a beetle and a snail. In the expansive valley below there are two more cities visible and cultivated fields.
In 1982 this image became the inspiration for a story in the BBC television series Doctor Who also titled Castrovalva.
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