In Bryce4, four spheres with mirrored surfaces are set up touching one another. (For extra credit,  you can figure out the center coordinates of the spheres.) Red and blue walls and a black ceiling are set up as shown. The floor is white and partially transparent. Under it, there is a spherical light flattened and sized into a large pancake. The intensity of the light is adjusted as needed. The camera is then brought right up close to view the area delineated by the four balls.