Contemplations on the Color Blue Symbolism in Outlander
Great insight @smashing-teacups! The color blue was always a healing color in the books and show It is no coincidence that by the end of that segment, Claire's hair is white, fulfilling Adawehi's prophecy in episode 04x04 that "When your hair is white like snow, you will have wisdom beyond time," including the implied ability to use blue light to heal (like Master Raymond heals Claire in episode 02x07).
Hence, Claire heals Jamie with the blue light, "calling [his soul] home" to his body and to Claire. Perhaps the color blue in Outlander not only represents healing, but perhaps it represents "calling" to the souls of loved ones, as well.
The finale also suggests the color blue has a part in Jamie "calling" Claire back "home to him" through the stones in the continuous time loop. (Thanks @gotham-ruaidh for introducing the endless time loop concept years ago!)
We see in the last episode that Jamie's ghost has so much love for Claire that it causes blue forget-me-nots to magically blossom beneath the tallest stone at Craigh na Dun.
Shortly afterward, those blue flowers catch Claire's eye, "calling to" her. In going back to pick them, she falls through the stones and "home" to Jamie.
And so the Jamie & Claire time loop continues it circular path on, and on, and on for eternity.
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The Claire GIF had as its base, this GIF, before edits.
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