For all the countless hours spent trying to complicate it and for every added layer of sophistication constructed by its indefatigable coaches and postgraduate level video students, football, even at the NFL level, still retains a ready simplicity.

Players still react to specific indicators in the game's visual logic, a universal understanding that if A happens, then B is virtually assured.

The understanding extends into every area of football culture.

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By Gene Collier, Pittsburgh Post-Gazette