"""I don't know how to phrase this right, but there is a knack of noticing material distinctions, rather than useless ones. Maybe it's in noticing when certain

"""I don't know how to phrase this right, but there is a knack of noticing material distinctions, rather than useless ones. Maybe it's in noticing when certain limitations have been removed or added."""" Knowing when a distinction is material frequently depends on context, goals, and experience. As Louis Pasteur said, "Chance favors only the prepared mind." I would be a little more generous, but still he's essentially right.