"Johann Wolfgang von Goethe spent a great deal of time worrying about stones. Not least, he was troubled by a giant 700-tonne granite rock that lay near the otherwise flat land near Berlin. What on earth was this alien to the region’s geology doing there? Goethe’s realisation that the strange mineral object must have been displaced by glaciers helped instigate the theory of ice ages and deep time. Stone provokes us to recalibrate our concept of the past and our place in the world. Rock is radical." Continue readingby clicking the grey bar underneath the image.