“This house originally had no windows that looked out on to the stone. Me and my kids have all climbed to the top. At night the lichen glows and is somewhat luminescent. We think it weighs about sixteen tons,” Pierce Thurstan tells me, as we gaze over the breakfast dishes to his backyard. Pierce is a sea master and takes boats out to Ramsey Island. From the kitchen window the stone fills up the view like a large pet sitting out back.