Wasp nest

We have an old wasp nest stored at our house (and there's one in the woods not far from here that's as big as a beachball, but too high for me to retrieve).  Ours is a rather homogeneous gray, quite a log power less impressive than this one from HarryR's Flickr photostream, found in an attic in the U.K.  His wasps must have had access to a nice variety of pulp materials.