Fringe separated it's realities per show with either red or blu credits/graphics.. This one might confuse a lot of people until you know what to look for.. As per the wiki
Quote:
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To differentiate between the two realities, Britten wears different colored rubber bands in each reality: a red one, for the one in which his wife is alive, and a green one, for the one in which his son is alive. Scenes in the "red" reality have a red hue, while scenes in the "green" reality have a green hue.
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