Antonio Carusone, describing himself as "a little obsessed with finding vintage design materials", has a look at NASA Graphic designs, circa 1970s.  Specifically, he hunted up this 1976 NASA Graphics Standards Manual.  Amidst the glories of clean modern design is the famous NASA 'worm' logo, which in 1992 was replaced by the somewhat controversial NASA 'meatball'.

NASA 'worm' logo  NASA 'meatball' logo 
 NASA 'worm' logo,
used 1975-1992 and
completely eradicated by 1997
 NASA 'meatball' logo,
used 1959-82 and 1992-present

What could be controversial about the meatball?  Primarily, people don't like change.  Also, some thought it was a political decision, with opinions ranging from "new director wants to put his stamp on agency" (as it was well acknowledged that Daniel Goldin hated the 'worm') to "trying to disassociate from the Challenger incident".

In either case, we have two designs.  I'm a meatball fan.  Which do you prefer?

Over and out,
Tuesdays at The Satellite Diaries and Friday at The Daytime Astronomer (twitter @skyday)
p.s. thanks to Marc Kuchner for pointing this out!