The seemlingly unfinished and stark interior of the Rutan Boomerang. Not to say that it isn't finished, but it gives you the impression that it isn't. Seen at EAA AirVenture 2011.
<a href="//commons.wikimedia.org/wiki/User:Spartan7W" title="User:Spartan7W">Spartan7W</a>
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<span class="int-own-work" lang="en">Own work</span>