The addition of charged distributions and Gaussian surfaces provides for much more sophisticated visualizations. This example includes a a charged sphere with inner radius a=20 and outer radius b=50. At the center of the charged sphere is a Gaussian surface of radius 10. Zoom in on the image to see that the electric field does not penetrate the Gaussian surface, and that the Gaussian surface is completely within the hollow center of the sphere.
Working through the details to get a reasonable appearance for nested translucent objects without complex rendering was definitely challenging.