A Mirror group consists of the line you cast plus its fanyao. But every line has its 'upside-down' counterpart in the paired hexagram, its Qianyao. Hex.1 upside down is still hex.1, but the moving line is now at the top: line 6. (More about qianyao)
So each complete mirror group has two fanyao-pairs.

1.1 + 44.1: "Do or do not there is no try"

Lines 44.1 and 1.1 are each other's fanyao
(what is a fanyao?)
Trigram Heaven in hex.1 changes to trigram Wind in hex.44. In hex.1 the laws of Heaven are (or should be) part of one's mind, actions, timing. In 44, with trigram Wind, they are what one knows one should do, or learn to do, or maybe teach others.

  1.1 Act acording to the demands of the time, or timing. When acting is too early, then simply stay put. But - seen from the other side, 44.1 - if there is any urge to move anyway, then retain it securely.

1.6 + 43.6: your opinion versus 'their' opinion.

Lines 1.6 and 43.6 are each other's fanyao.
Trigram Heaven in hex.1 changes to trigram Lake in hex.43
In hex.1 the laws of Heaven are (or should be) part of one's mind, actions, timing.

Mirror groupings 1.1 and 2.1 are contrasts
  Opposite, contrasting or complementary: all yang lines in the mirror-group 1.1 are yin lines in mirror-group 2.1 and vv.

  This Mirror group 01.1 is about living by the right codes or laws for actions.
Mirror group 02.1 is about living from out your own true base for actions and mind.
  Both: actions are good when their laws and foundations are right.

Qian yao

The fanyao shows what to do or not to do.
The qianyao shows that things should be in balance.

 

How I found the Mirrors and how they work