paper.js how to set up multiple canvases using only javascript

I'm trying to use paper.js in a webapp, but I've been unable to get it to work with multiple canvases. It's like the scopes are getting mixed up between the canvases, so when I intend to draw on canvas 1, it appears on canvas 2.

In each view, I'm initialize the paper like this:

this.mypaper = new paper.PaperScope();
this.mypaper.setup($("myCanvasId")[0]);

When I create new paper objects, I use what should be the local scope:

var circle = new this.mypaper.Path.Circle(10, 10, 5);

However, when I create a circle in view1, it draws it in view2 instead.

I've done a lot of reading, but I still haven't found a clear explanation of how to setup multiple paperscopes or how to isolate views from each other.

Does anyone know how to use multiple canvases with paper.js correctly?

EDIT: I've created a jsFiddle to illustrate the problem: http://jsfiddle.net/94RTX/1/