This looks like a pile of wooden cubes with odd images on them.
Assemble them correctly, and you get a 3-D image of the brain…except
you can’t see it when you are done…
…because the image is entirely inside.
The real puzzle is this: Where do you get one? I found it on
three sites ( href="http://www.odditycentral.com/pics/the-brain-cube.html">1
but nobody links to the original source.