Check it out: 31 years but in prefect conditions. It can become tangled. It can be torn. It can be unravelled. It can help you if you get lost: just pick one end of the thread. At times it won’t get out and has to be strained and pulled vigorously. It keeps you warm at night, or in winter. It has its own story: it has been spun and wrapped by skilful hands, thrown to cats to play with, recovered and re-wrapped, tied and snapped, on the whole it’s used but well kept.