(trigram and hexagram, places earth-earth, earth-man, heaven-man, heaven-heaven)
But since a hexagram also consists of two trigrams, the bottom lines of those two trigrams have something in common. Same goes for the middle and the top lines.
Line 1 and 4 have 'something' in common.
Lines 2 and 5
Lines 3 and 6.
Since hexagrams 1 and 2 are very essential - not so much descriptions of a particular situation but rather of the yang and yin of any situation - their lines give a quite clear image of the meanings of the line-places.
Hexagrams and trigrams are both built up from bottom to top, from earth through man to heaven.
Hexagrams bottom-bottom-man-man-heaven-heaven. Trigrams earth-man-heaven.
At left one hexagram, at right two trigrams.
The hexagram is more specific,
the trigram more universal.
Heaven is intangible, mind, time, spiritual values, visions.
Line 6: pure heaven, intangible.
Line 3 is 'heaven in man': everything which is intangible and yet often visible. Thoughts, memories, emotions and obsessions.
Line 5 is 'man in heaven': the bird's eye view, the ability to look farther than one's own life and direct surroundings, to see the ways and needs of others, of the community, or to see the big picture of a combination of many small facts.