Solid Drawing.

Solid drawing is an outdated principal in many respects due to the use of digital media, however, with traditional animation, it was important to have controlled drawing skills so you can draw the same character as some one else, making the character look the same, as well as being able to animate frames without there being any distortion of the character. This doesn't really apply to gaming as there is little need to have to draw in the way meant for the principal.