1. Inkwell is a "2 and 1/2d" animation system.  It is called 2 and 1/2
dimensional because it keeps track of the order objects are drawn in.

2.  The paper is trying to solve the problem of creating an intuitive
animation system that is as close as possible to actual drawing and
painting as possible.

3.  Describes a animation system for 2.5d animation with features
including: specification of key frames, filtering of the motion
parameters, and warping geometry and texture.

4. key ideas: use like actual drawing and painting, drawing of filters
of motion parameters, and various methods for warping geometry and
texture.

5. Contributions - hopefully intuitive system for producing 2d
animations, an animation system that is closer to being and extension
of drawing and painting.