Red Pill Vs. Blue Pill
The red pill and its opposite, the blue pill, are a popular cultural meme, a metaphor representing the choice between knowledge, freedom, uncertainty and the brutal truths of reality (red pill), and then security, happiness, beauty, and the blissful ignorance of illusion (blue pill).
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Origin
Often cited as from the film "The Matrix", but can be traced to similar concepts in Lewis Carroll's "Alice in Wonderland".