No, I haven't gone off the deep-end.
Biologists believe the phenomenon is an instinctive form of territorial marking behaviour.
During the Middle Ages, creative cats were associated with the devil, and many suffered violent fates as a result. Feline art was trivialized in Victorian times, and many a gifted kitty was forced to perform in sensationalist vaudeville shows. Back to the future Traditional biologists are reluctant to concede that cat painting is artis-tically motivated. Instead, they prefer a more scientific theory. Domestic cats mark territory with their feces or urine, and often indicate its position with lines radiating out from it.