Im trying to do something similiar, Im subrtacting an isosurface from a 
box filled with water. I was originally planning to fill the bubbles 
with media, but I still havnt worked out all the details of the 
reflecting/refracting surfaces. since the surface of the bubble is a 
very comples distortion of the images of the inside of the bubble and 
outside its hard to see the media.
so far my biggest confusion has been with choice of object to make 
hollow. I know that the bubbles are hollow, but does the water box need 
to be hollow in order for the media to work inside the bubbles?
attached are two bubbles, the one on the right has a negative ior. the 
bubbles are hollow, but the box is not. the media is 
next...{bubble_(1_-1 ior).jpg)

the bubble here is only part of image, im going to attempt ro tender 
this voernight, and see if there are any more 
changes...{bulbble_(max_trace10).jpg)

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