Cats were often familiars to workers of magic because to anyone used to wrestling with self-willed, wayward, devious magic--which was what all magic was--it was rather soothing to have all the same qualities wrapped up in a small, furry, generally attractive bundle that...might, if it were in a good mood, sit on your knee and purr. Magic never sat on anybody's knee and purred.
Some sounds are so exquisite - far more exquisite than anything seen. Daff's purr there on my rug, for instance - and the snap and crackle of the fire - and the squeaks and scrambles of mice that are having a jamboree behind the wainscot.
all cats have a Spanish tinge although Puss himself elegantly lubricates his virile, muscular, native Bergamasque with French, since that is the only language in which you can purr.