I will preface this lesson by saying that you should always beware of things that are too guitaristic or fretboard generated. Most times those devices tend to come off as nothing more than finger tricks. Music should always be about sound and not fingers.
That said, these mirror shapes are indeed very guitaristic and a are derived from their physical shape on the fretboard. But – they sound great and quite unique so we don’t want to throw out the baby with the bath water! If it sounds good, it is good and no rules should steer you away from that.
What we will do is take a fretboard shape and invert it into its mirror fingering one fret higher. Then we’ll move up another fret and revert to the original finger and keep that cycle repeating all the way up the fretboard.