the pool balls are reflective and the white sphere, while not an image, is being picked up by the balls. Perhaps this would not be called fake hdri, but its the same principal. Isnt it? lol (I will accept any answer and assume you are right!) Anyway, the brief description I have above was originally posted by Madmax BR5. Check out other posts by Shadowdragonlord, Agent Smith, Drawbridgerep on this subject.