by the world renowned italian artist giuseppe penone. , giuseppe, tell me about the rock in the tree. the tree is related to the idea of growing of the tree, that is attracted by light, and the rock is related to the idea of gravity force. penone is like the david attenborough of art. he spends his life observing nature to make work that heightens our awareness of its beauty and power. the tree, he says, is the perfect sculpture, because it balances the weight of life as all living things must do, with a poetic fluidity. a tree is between two worlds. the underground and the upper. so i have done this piece that is horizontal and in this point there was a branch, and i cut the branch. i put clay and i have done the print of my hand. is this comment on the tree of life? if you want, it is possible! it is possible. who the better sculptor, nature or you? i don't know. the better sculptor is nature but i am happy. i suppose the answer is to come along and judge for yourself, nature's wood or giuseppe penone‘s bronzes. will gompertz, bbc news,