Many of us have had that unsettling moment when, working off the computer, we habitually and almost involuntarily gesture for the keyboard to UNDO something. The profound frequency with which we use the shortcut Command-Z leads our minds to believe we can undo actions in real-time, followed by that sinking feeling that you must physically restore to a previous state, moving things around or erasing things in the hopes you can closely replicate what you had before.

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