“To the imaginative, it is always something of an adventure to walk down a pleached alley. You enter boldly enough, but soon you find yourself wishing you had stayed outside — it is not air that you are breathing, but silence, the almost palpable silence of trees. And is the only exit that small round hole in the distance? Why, you will never be able to squeeze through that! You must turn back ... too late! The spacious portal by which you entered has in its turn shrunk to a small round hole.”