Hexagram Mirrors - Line Reflections
Lines 37.3 and 42.3 are each others fanyao, like views on the same landscape but from a different side. Asking for different actions.
See Mirror-index for explanation.
Lines 38.4 and 41.4 are each others fanyao, like views on the same landscape but from a different side. Asking for different (and complementary) actions.
Lines 37.3 and 38.4 and also 41.4 and 42.3 are each others qianyao (upside-down). Here are similar actions but in different (but complementary) landscapes (context). What was up, outside or mental, is now down, inside or physical.
Mirror groups a and b are contrasts
(all yang lines of Mirror 37.3 are yin lines in Mirror 31.4 and vv)
Explanations see How I found the Mirrors and how they work
Mirror 37.3 is about having a strong structure
Mirror 31.4 is about adapting actions and reactions to reality.