We are very glad Moby has always liked the tree. More or less at different times, but he's always known it was His Tree. We were always prepared to use it as a bookshelf if he was going to be a Cat about it.
I have always pulled his tail, as an extension of petting his back, as a massage technique, gently but firmly, with affection. And he seems to enjoy it, circling around for me to stroke him repeatedly. If he'd ever objected to it, I would never have done it, but he seems to take it in good part. His happy place is right above his tail, and when I scritch there, he stands still with his tail straight up, sometimes his head seems to move down to rub the ground in pleasure of it's own accord, and I stretch his tail out and up, completing the caress.
This is not the same as pulling a cat's tail.