Bent reflecting surfaces are of unabated fascination to me -- and always a nightmare to render. The fully reflective positive torus the camera is within, is grouped with a negative fully transparent cylinder at the hub of the torus. Light from the sky (orange) bleeds into the ring through this cylinder. The smaller ring is half transparent and half reflecting, has metallic effect and is tilted. A blue and a green light are in the back, side by side and a red one in front. The render depth has been set to 8. With this configuration, such a picture results.