Droog's Do Hit Chair, complete with sledgehammer

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Droog Design's Do Hit Chair is a cube made from .04" steel. It's shipped with a sledgehammer for you to customize it's shape yourself. Created by Marjin van der Poll, it's available from Unica Home for $6718 for one that he pre-hammered. A smash-your-own model is $5924.
Link (via Paper Magazine)

UPDATE: Here is a video of the chair being customized. Link