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Why would you try to start a fight in your first post?
Now I've never met Hal, I have the CTE book by Stan. It works. So does other systems. CTE does a more thorough job of explaining how to properly sight balls. That is great, head and shoulders above many instructional materials.
Without ever knowing or talking to Hal, I find it very curious that a pool ball is sort of close to the average distance between pupils. It's not exact, but put a CB between your eyes and tell me what you see. We see in stereo, it makes sense to use 2 reference points. Does everyone need them? No, but they are a nice thing to have and help to mitigate sighting errors.
boogieman <<< not a hater, but also not someone who thinks CTE is the only path to pool nirvana. Use what you use, but be aware CTE does have a lot of good stuff going for it.