“Our thinking is shaped by dualism. Entrance, exit. Black, white. Good, evil. Everything appears as opposite pairs. But that’s wrong.” – H.G. Tannhaus
《DARK》精彩之處，在於對「二元性」的詮釋：
Gestern und Heute (Past and Present)
Anfänge und Enden (Beginnings and Endings)
Vom Suchen und Finden (Lost and Found)
Enden und Anfänge (Endings and Beginnings)
Leben und Tod (Life and Death)
Licht und Schatten (Light and Shadow)
Adam und Eva (Adam and Eva)
第三季特意改變主角，轉換視點，但一些根本性概念不變。劇中分裂了兩個世界：Adam’s World和Eva’s World （兩個名字均帶點宗教意味），分別以「毀滅」及「保存」世界的對立信念存在。因為各自的執念，令兩個世界的結（「∞」）越纏越緊。執著於修正過去的錯誤，嘗試改變未來的方向，反而令角色無意識地墜入輪迴的漩渦。
「三角飾」(Triquetra)
Eine Reise durch die Zeit (A Journey Through Time) by H. G. Tannhaus
“A man lives three lives. The first one ends with the loss of naivety, the second, with the loss of innocence and the third… with the loss of life itself. It’s inevitable that we go through all three stages.”
故事、人物、時空設定圍繞著「三角飾」發展：三個不同時期的自己，於間距33年的時空穿梭；老中青的自己同時存在於同一空間，如在第三季頻繁登場、結合兩個世界的「The Unknown」便是例子之一；三個可能世界 (Adam’s World, Eva’s World, Original World)；情慾上糾纏難解的三角關係（全劇最令人頭痛的部份）；「潘洛斯三角」(Penrose triangle)，這個被神秘組織Sic Mundus Creatus Est採用的無限三角符號符號，令原本難解的「∞」結更難解。
參考： 1) 間距33年的時空： Season 1 – 1953, 1986, 2019, 2052 Season 2 – 1921, 1954, 1987, 2053 Season 3 – 1888, 1921, 1954, 1987, 2053 2) 神秘數字「33」隱含時間旅行、預言、神蹟等意義（詳文按此） 3)「潘洛斯三角」(Penrose triangle) 為《Eine Reise durch die Zeit》(A Journey through time) 一書封面
“Sic Mundus Creatus Est”
Emerald Tablet tattoo
這句被時間旅行者組織採用為名字的句子，拉丁語解作 “Thus, the world was created.”，來自希臘傳說中赫密士·崔斯墨圖 (Hermes Trismegistus) 雕刻在《翠玉錄》(Emerald Tablet) 上的箴言。《翠玉錄》的圖像亦被刺在時間旅行者的身上，也出現在劇中物件如掛畫、唱片封面上。
時間旅行者 (Die Zeitreisenden) 在Adam’s World稱為 “Sic Mundus Creatus Est”，在Eva’s World則稱為 “Erit Lux” （拉丁語解作 “There will be light.” ），對應「黑暗」與「光明」。
第三季第一集便以德國哲學家叔本華 (Arthur Schopenhauer) 的名言說明，我們並沒有所謂「自由意志」： “Man can do what he wills, but he cannot will what he wills.” 劇中主要角色都有不惜回到過去改變結果的理由，主要原因都是「愛」，因而變成「絆」。在過去現在未來互相緊扣的影響下，過程中的「自我意識」可能只是被設定的一部份，也解釋了為何劇中某些角色會重複相同對白、會不時岀現「以曾相識」的感覺與行徑，而很多決定與行為都「必須」發生。唯有如此，Jonas才能成為Adam，Martha才能成為Eva。這是一個宿命。（從編劇角度看，這是一種手段。）
“We trust that time is linear. That it proceeds eternally, uniformly. Into infinity. But the distinction between past, present and future is nothing but an illusion.Yesterday, today and tomorrow are not consecutive, they are connected in a never-ending circle. Everything is connected.” – The Stranger
“Only when we’ve freed ourselves of emotion can we be truly free. Only when you’re willing to sacrifice what you hold dearest.” – Adam
“The mistake in all of our thinking is that we each believe ourselves to be an independent entity. While in reality, we’re all just fractions of an infinite whole.” – Eva
“I’ve already trod on dangerous ground; we’re on dangerous ground right now, because of our secrets and our lies. They’re practically what define us. When the truth offends, we… we lie and lie until we can no longer remember it is even there, but it is still there. Every lie we tell incurs a debt to the truth. Sooner or later, that debt is paid. That is how an RBMK reactor core explodes: lies.”
“To be a scientist is to be naive. We are so focused on our search for the truth we fail to consider how few actually want us to find it. But it is always there whether we see it or not, whether we choose to or not. The truth doesn’t care about our needs or wants; it doesn’t care about our governments, our ideologies, our religions. It will lie in wait for all time. And this at last is the gift of Chernobyl. Where I once would fear the cost of truth, I now only ask… what is the cost of lies?”
Cardinal Jorge Bergoglio: “It’s not easy to entrust oneself to God’s mercy. I know He has a very special capacity for forgetting our mistakes. God forgets, but I don’t.”
Pope Benedict: “All dictatorships take away our freedom to choose. We both know that. Or reveal our own weaknesses… It is our weakness that calls forth the grace of God. You show your weakness, He gives us strength.”
戲外話： 1）原來此片由《無主之城》(Cidade de Deus) (2002) 的導演之一執導 2）電影原創配樂由樂隊The National的結他手之一Bryce Dessner包辦
s w i n g , s w i n g 