This is what 5 of your favorite Pixar movies looked like in early sketches before they hit the big screen

It takes a lot of work, and a lot of trial and error, to bring an animated world to life.

This is especially true for Pixar, which continues to put out some of the most beloved animated films of all time.

But before they can go from a computer to the big screen, the movies must first be sketched out with pen and paper.

An exhibit at the Cooper Hewitt Museum in Manhattan called "Pixar: The Design of Story" shows off some of the most beloved Pixar films and characters in their earliest forms, from Woody in "Toy Story" to Sadness in "Inside Out."

Check out what some classic Pixar characters originally looked like:

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A number of critics and fans think "Wall-E" is still Pixar's best film.

Wall-E is a very sophisticated robot. Putting him together took a lot of thought and attention to intricate details.

Early sketches focused on how exactly the robot's arms would move.