Sustainability. This is a piece called Norwegian Sweater by Celia Pym. She took an old, damaged jumper that couldn't be worn and repaired it to create this. It reminds me of the 'make do and mend' attitude people used to have - proof you can turn something that is no use to anyone into something beautiful and functional again.
The Marauders - Harry Potter and the Prisoner of Azkaban, Chapter Nineteen ↳ The Servant of Lord Voldemort “Remus!” Pettigrew squeaked, turning to Lupin instead, writhing imploringly in front of him. “You don’t believe this… Wouldn’t Sirius have told you they’d changed the plan?” “Not if he thought I was the spy, Peter,” said Lupin. “I assume that’s why you didn’t tell me, Sirius?” he said casually over Pettigrew’s head. “Forgive me, Remus,” said Black.