Jacinto Zarabata sits in a suburban back garden in north London and unselfconsciously uses a stick to probe the inside of a gourd, which is shaped like a rather phallic mushroom with a bright yellow cap. The first member of the Kogi people of Colombia ever to visit Britain is wearing traditional rough cotton clothes and has a cloth bag slung over each shoulder as he chews toasted coca leaves.
It would be easy to view Jacinto as a noble savage; an exotic being from a pristine indigenous culture still living in impenetrable pockets of the Sierra Nevada de Santa Marta, the highest coastal mountain range in the world. But this small, self-assured spokesman for the Kogi soon subverts that stereotype. As he answers my first question in fluent Spanish, he delves into one bag, extracts a camera and takes a photograph of me.