Message In A Bottle in SVG

I love minimal graphics and the shapes that negative space can form so I created this soothing animation. It's designed in Illustrator and the SVG output is animated on CodePen using JavaScript (Greensock).

The GIF loop isn't perfect because it's not designed to loop - all animation cycles (and nested cycles) are timed differently to create a more natural feel.

You can see the original SVG animation on CodePen:
http://codepen.io/chrisgannon/pen/NqaqPR