Allées of clipped lime trees are a common feature in the more formal Paris parks and squares. This is one of those surrounding the Place des Vosges.  The fallen leaves are cleared away promptly in autumn, leaving rows of angular tree skeletons standing starkly in the swept gravel for five months of the year.  Then the weather warms up a little and suddenly the whole aspect of the park is softened by a delicate canopy of translucent green, shivering in the breeze.  The heavy shadow cast by the mature leaves will be welcome in the summer heat, but for now you can stroll under the branches in a poetic ‘green shade’.