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Presenter Sian Eleri visits Parys Mountain in Anglesey, north west Wales, for a Green Space Dark Skies event – a mass participation project that celebrates the landscape and creates extraordinary artwork on it at dusk, using specially designed ‘geo-lights’.

Becoming a ‘lumenator’, and joining hundreds of other volunteers, Sian talks to the people that created the project, as well as award-winning beatboxer and event performer Mr Phormula and geologist Professor Cynthia Burek, discovering the rich history behind the world’s oldest copper mine. Alongside her unique experience on Parys Mountain, Sian explores the previous events which took place at Craig-Y-Nos country park and Three Cliffs Bay, Gower, showcasing the short films that were made from those events.