Does your cat like boxes?

My cat goes crazy for boxes. When he's in a box and you put your hand in it, he'll grab it with his paws. I like to tap the side of the box when he's hiding in it, and he'll paw at the side of the box where I tapped. When we had taken in some abandoned kittens, he would play "fort" with the kittens in his little box. He'd hide in the box and protect it from the kittens when they got too close. He also likes to sleep in boxes. He would absolutely love those "Catty Stacks."