Sofie Benoot’s film opens out from the film-maker’s medical problem to a diverting reflection on humankind’s deep roots in ancient minerals Sofie Benoot’s film opens out from the film-maker’s medical problem to a diverting reflection on humankind’s deep roots in ancient minerals T he elegant, humorous, susurrating Welsh voice of Siân Phillips sets the keynote for this whimsical essay documentary from Belgian film-maker Sofie Benoot about the nature of rock and stone, and the mysterious