As a divinatory line, six at the second place of Obstruction reads within the hexagram's overall concern with advantage found in the southwest, and the contrary in the northeast, advantage in seeing the great man, and in being firm and correct. The line occupies a place proper to its own nature in the classical doctrine that odd places favour a firm, yang line and even places favour a yielding, yin line. It is also one of the two central lines of the hexagram, the place classical reading treats as the most balanced regardless of the line's own character. Its own text, that the king's minister struggling with difficulty upon difficulty, not for his own sake, is the particular fortune assigned to this one stage of the situation, not to the hexagram as a whole.
The second line corresponds by classical convention with the fifth line, and the two correspond here, since one line is yin and the other yang. Read together with the trigram it belongs to, Gen in the lower position of the figure, the line marks the situation settling into its own character, still wholly inside the lower trigram, one stage in the six stage movement the hexagram traces from its first line to its last.
A change at this line, from yin to its opposite, is the mechanism the tradition uses to move from one hexagram to another. Flipping the second line of Obstruction turns Gen into Xun while the other trigram, Kan, stays as it is, which yields Obstruction's changing partner, The Well (King Wen 48), the hexagram this line is recorded as transforming into.