Prehistoric engravings of giant snakes along South America’s Orinoco river are among the largest examples of rock art we know of anywhere in the world, with some stretching for more than 40 metres.

The biggest, a vast 900-year-old 411-metre-long earthwork representing a giant snake, can still be seen on a hilltop in southern Ohio. An archaeologist’s drawing of another giant snake engraving.

Later, she worked in art therapy, then murals, as furniture painter and as a full-time artist. “I joke that I am an overnight success after 10 years,” she said.