REK Extending Bookcase by Reinier de Jong

Earlier in the week, we posted about the Platzhadler Expandable Bookshelves. This morning we ran across a similar idea with Reinier de Jong's design for the REK extending bookcase...

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Reinier de Jong's REK has five parts that slide in and out fo each other to customize the size of your bookcase. We must admit that we like this version of an extending bookcase much better! Can anyone read Dutch? Where is the REK available and how much does it cost? Via: dezeen.