A master at standup bass and an expert on feline bathroom etiquette:
Now, as you move the box, also start cutting the brim of the box down, so the sides get lower. Do this gradually.
Finally, you reach the bathroom and, eventually, the toilet itself. Then, one day, prepare to put the box on top of the toilet. At each corner of the box, cut a little slash. You can run string around the box, through these slashes, and tie the box down to the toilet so it will not fall off. Your cat will see it there and jump up to the box, which is now sitting on top of the toilet (with the sides cut down to only an inch or so.)
Don’t bug the cat now, don’t rush him, because you might throw him off. Just let him relax and go there for awhile-maybe a week or two. Meanwhile, put less and less newspaper inside the box.