To note: Javascript is not running in this browser environment. The canvas element is ignored; instead a placeholder image displays where the canvas would have appeared.
Test purpose
Generate a new Cell to act as paper for the scene
Create a scene with a Line entity on the right and a number of Wheel entitys using it as their path.
Animate the scene using the new Cell's splitShift() function. The Wheels will appear to create streaming ribbons as the paper Cell's contents shift leftwards.
Vary the animation speed. When the speed drops below zero the animation will shift the paper to the right.