he Gummitch Double—staring up at him.

Gummitch had early discovered that water mirrors are very different from most glass mirrors. The scentless spirit world behind glass mirrors is an upright one sharing our gravity system, its floor a continuation of the floor in the so-called real world. But the world in a water mirror has reverse gravity. One looks down into it, but the spirit-doubles in it look up at one. In a way water mirrors are holes or pits in the world, leading down to a spirit infinity or ghostly nadir.

Gummitch had pondered as to whether, if he plunged into such a pit, he would be sustained by the spirit gravity or fall forever. (It may well be that speculations of this sort account for the caution about swimming characteristic of most cats.)

There was at least one exception to the general rule. The looking glass on Kitty-Come-Here's dressing table also opened into a spirit world of reverse gravity, as Gummitch had discovered when he happened to look into it during one of the regular visits he made to the dressing table top, to enjoy the delightful flowery and musky odors emanating from the fragile bottles assembled there.

But exceptions to general rules, as Gummitch knew well, are only doorways to further knowledge and finer classifications. The wind could not get into the spirit world below Kitty-Come-Here's looking glass, while one of the definitive characteristics of water mirrors is that movement can very easily enter the spirit world below them, rhythmically disturbing it throughout, producing the most surreal effects, and even reducing it to chaos. Such disturbances exist only in the spirit world and are in no way a mirroring of anything in the real world: Gummitch knew that his paw did not change when it flicked the surface of the water, although the image of his paw burst into a hundred flickering fragments. (Both cats and primitive men first deduced that the world