Lets see BoSox. How many players have you ever heard mention this very specific topic of using the mirrored ceilings to track a table across the pit?
I can think of two that have mentioned doing this very specific thing. Both participate here. And as it turns out both of us talking about the exact same location in Atlantic City, many years ago, long before we even knew of each other. But I will say this about it. 1.) I am in good company.
and 2.) I would bet there are others that played AC back then that took advantage of this.
This discussion actually came about from a slightly more general discussion of tracking a second table while playing one., a technique I have been employing since moving to Vegas almost a decade ago. And there were also quite a number of very experienced successful players that do this as well. Don Schlesinger told me he has been doing this for 40 years.
I don't think players or members of these forums that laugh at that technique and immediately dismiss it have any idea just how powerful it is. You are able to exit a negative or neutral but not very promising count at one table and immediately jump to a positive count or much more advantageous situation at the next with zero down time. This means you are actually changing the true count frequencies and seeing and playing significantly more positive count situations including "max bet" situations per 100 rounds played. Significant increase in win rate. Much more significant that things like what count, that are often discussed (to death).
Now of course, John eluded to variance, not specific improvement in win rate. I'll let Don or one of the many other guys much smarter than me answer that one. But I'll tell you this much. There is way to much obsession with reducing variance in my opinion. Blackjack card counting is an advantage play with a very small edge and fairly high variance. The way to eliminate worries about variance is to be properly bankrolled.