So here it is with shadows applied... thanks to all for the input, and I agree with everyone that it certainly is more realistic. But I'm confused... in the first, shadowless rendering, I had only sunlight and shadows disabled in the Sky Lab. It seems that all the radial lights' shadows were disabled as well by this action. Do the Sky Lab light/shadow settings always override individual radial light shadow settings, or am I missing something? In other words, must I always have Sky Lab shadows enabled in order to have radial lights cast a shadow? Thanks again!