Gestures on the <canvas>

I’ve begun developing an algorithmic, recursive gestural tree using JavaScript to draw into the HTML5 <canvas> element.  After running into a few initial problems, like discovering I was overflowing my browser stack limit, I progressed to some scribbly sketches.

Fixing the locating problems yielded these:

I then decided to move towards a continuous, single line composed of Bezier segments:

This could easily pave the way for a recursive sketching algorithm that composes each Bezier segment from n number of smaller Bezier segments down to a predefined number of levels.  The larger question, in this investigation, remains: what determines the high-level gestures?