The Nest is a Russian nesting doll shelving unit,which can be pulled apart to "grow" to any size and configuration you want.
Here's something that's happened to everyone. You've got a pile of books just sort of hanging out, looking like a bomb went off. So you decide to buy some shelves for them. You buy a perfectly sized shelving unit, or arrange your books on the shelves with care—then rapidly forward three months,when your book collection has exploded again, and your perfectly sized shelving unit has proven comically inadequate.
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Source: fastcompany.com