This is a nit-picky point, but of the movies you mentioned, only "Up" and "Toy Story 3" are actually Pixar films. "Bolt", "Rapunzel", and "King of the Elves" are all films by the Walt Disney Animation Studios (formerly Walt Disney Feature Animation). When Disney bought Pixar, they agreed to continue operating the two studios independently (although John Lasseter now oversees both).
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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This is a nit-picky point, but of the movies you mentioned, only "Up" and "Toy Story 3" are actually Pixar films. "Bolt", "Rapunzel", and "King of the Elves" are all films by the Walt Disney Animation Studios (formerly Walt Disney Feature Animation). When Disney bought Pixar, they agreed to continue operating the two studios independently (although John Lasseter now oversees both).