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Sofas, dining tables, chairs: These are the pieces you’ll so often find labeled as "investment furniture," those pricier objects that take center stage in a home and are loved and lived with for a lifetime. They accompany you through new jobs, moves, and maybe even relationships. Even if it comes time to downsize, they aren’t the pieces you shed. But say your space is tiny, you live in a city, and you really love organization: Enter the modular shelving unit.