"See here?" Ron swirled his finger in slow spiral motions around the runes that he’d written in a spiral on the floor. "You said that the Horcrux in you feels like a sort of spiral shape, and that’s what I saw when I used Legilimency on you, too. So I reckon we come up with a ritual circle in the shape of a spiral and write it on the Horcrux, and we write one that’s a spiral going the opposite direction, and write it on Voldemort’s spirit, and the runes unravel each other, and there you are."