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To see the forest for the trees suggests that a person is capable of discerning the bigger picture, from observing the more granular details. Conversely, when used in the negative form, this suggests that someone is easily preoccupied by the details, thus allowing them to obscure the bigger picture.
She has a strong ability to grasp the big picture, always able to "see the forest for the trees".
by TheSoph April 09, 2014