boxes-and-bubbles

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I may not understand what it's supposed to do, or maybe it's a bug, but I can't seem to get them to position correctly. If I change the math a little bit from this:

box (w,thickness) inf restitution (cx, hExt+halfThick) (0,0) meta,
box (w,thickness) inf restitution (cx, -(hExt+halfThick)) (0,0) meta,
box (thickness,h) inf restitution (wExt+halfThick, cy) (0,0) meta,
box (thickness,h) inf restitution (-(wExt+halfThick), cy) (0,0) meta

To this:

box (w,thickness) inf restitution (cx, cy + (hExt+halfThick)) (0,0) meta,
box (w,thickness) inf restitution (cx, cy - (hExt+halfThick)) (0,0) meta,
box (thickness,h) inf restitution (cx + (wExt+halfThick), cy) (0,0) meta,
box (thickness,h) inf restitution (cx - (wExt+halfThick), cy) (0,0) meta

Then it behaves exactly as I expect.

https://github.com/jastice/boxes-and-bubbles/blob/master/src/BoxesAndBubbles.elm#L109-L112