You should read Tom Duff's original email about this: https://www.lysator.liu.se/c/duffs-device.html https://www.lysator.liu.se/c/duffs-device.html A quote of

You should read Tom Duff's original email about this: https://www.lysator.liu.se/c/duffs-device.html https://www.lysator.liu.se/c/duffs-device.html A quote of the man himself about this: "I feel a combination of pride and revulsion at this discovery."