Their enticing sharpness allows pins to pierce through materials, including our skin. As straight lines they are capable of amplifying the movement of a surface they’re connected to, and collectively they accumulate into a soft manoeuvreable fur. With a hole on one end they can pull a soft line of thread through other materials, holding these together to construct three-dimensional forms. Being made of metal they are able to conduct electricity, and can be used to close a circuit to detect touch. As simple and commonly known tools they are transparent and familiar, and we use them to manipulate our world.