While not as shockingly unusual as the knitted teratoma I reported on a while back, this knitted brain (located at the awesomely-titled ‘Museum of Scientifically Accurate Fabric Brain Art’) is equally amazing. Regions are knitted with varying colors, and the corpus callosum is a zipper!
Here’s a view of the brain from above, and “opened-up” (the hemispeheres seperated with yarn spinal cord trailing.)

Artist: Karen Norberg, Location: Boston Museum of Science
“Building a brain with yarn and knitting needles turns out to follow many of the same pathways as actual brain development,” says Norberg.
Here’s a side view:
