Sarah Eberle had a dream - but, for Bradstone development manager Peter Britton, it could have been his worst nightmare.
Instead, he and his team have relished the challenge of creating rock structures on Earth which might credibly come from Mars.
Here, he describes the journey.
Follow the journey of rock blasted from Glensanda quarry on the Argyll coast of Scotland all the way to finished product installed in a show garden at Chelsea.