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Devices and systems designed to operate across the four dimensions of spacetime, treating time as a manipulable dimension rather than a one-way flow. 4D [technologies] include temporal browsers (letting you view past and future versions of websites), 4D printers (that print objects which change shape over time—imagine a chair that becomes a table at noon), and the much-anticipated "time-back" button that lets you undo the last five minutes of your life (currently only works for [video games], and only sometimes). [The holy grail] of 4D technology is the "worldline navigator," which would let you see your complete four-dimensional self from birth to death, assuming you want to know how it ends. Most people don't buy it.
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