How to render a slice to make it look really inside an object?

Hi, I have a slice, which shows inside of a real sphere. I want to render this slice to make it look really inside the sphere. I know the relative pose of the slice to the real sphere, so the view matrix is not an issue. The problem if how to add some visual effect to make it looks real. If I just simply render both sphere and the slice, it give a feeling the slice is dangling in the air. The way I can figure out is to add a hole geometry on the sphere to give us a feeling that we look the slice through a hole, so the slice looks like inside the sphere. Any suggestion about this method and other suggestions? Thanks a lot! YL