For a book on knot-making, I collaborated closely with the production department to introduce an innovative and practical design element. We created a hole in the book block (top right, near the spine) through which red cord was threaded, allowing readers to practice making knots directly on the book. This interactive feature not only enhanced the practicality of the book but also made it visually distinct on the shelf, giving it a unique selling point that set it apart from similar products.