I don't think i've ever seen this 'ability' that people say he has.
It has to be viewed through a veil darkly. It can be appreciated more in the perception than in the manifestation, and not everyone has that gift of second sight, required to fully appreciate it. A seventh son of a seventh son would be well placed to describe his hidden talents, I'd suggest, beyond that I cannot enlighten you any further, as my own vision is somewhat impaired by the cursed and relentless onset of advancing years!