 And here the clean cat used to sun himself in the clean garden, thinking his clean thoughts and perishing of ennui cleaned through. Then one day, from the vulgar outer world came an unclean incident. Omar Ben became conscious of an uproar beyond the garden wall. It embraced a whimper of canine hope, a spitting taunt, and the patter of flying paws. Then suddenly, on the top of the high brick wall appeared a cat.