This is clipart converted and broken apart that has been released into the public domain because the document says so, and its from NASA, a USA government agency. The publication is called "The Brain in Space:"
http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The.Brain.in.Space.html
UPDATED on 2009 January 20 with ten new ones. Perhaps I should have called them "Plastic Letters". The last ones have glow and transparency effects. I placed a background to show it better. Specular light added to some of the contour effects. A little bit grainy because of Inkscape specular light limitations, but not a too big problem. Well adapted to small filled shapes too. Colorizable. Modifiable.
This is clipart converted and broken apart that has been released into the public domain because the document says so, and its from NASA, a USA government agency. The publication is called "The Brain in Space:"
http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The.Brain.in.Space.html