She bought a specific pin after finishing a marathon, another when she got a promotion, and one to celebrate a trip to Amsterdam.

The next month, she bought another—a small enamel coffee cup—because it was the start of a difficult project at work and she needed a "reminder that she could do hard things."

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Sarah didn’t intend to become a collector. She just bought a single, small enamel pin of a retro roller skate at a flea market because it reminded her of her childhood.