Writing a 'small stone' every day in January 2012 AND January 2014
Haha, and they love it don't they?
I always think of a cat doing this as like a child sucking their thumb. Cats seem to do it to calm themselves and go into a trance-like state. Maybe it's their version of meditation!
I sense the possibility of a small tortoise-shell rug, to replace your jumper.
The cat likes your suggestion, J; she's black and white! ;-)
Black and white rugs are SO 2011...!