A useless machine or useless box is a device which has a function but its direct purpose is deliberately unknown.
“Useless machines” have recently gained popularity with commercial success. They could be used as an amusing engineering "hack", or as a joke.
The most well-known "useless machines" are those inspired by Marvin Minsky's design, in which the device's sole function is to switch itself off by operating its own "off" switch. Their popularity has recently been raised by commercial success. More elaborate devices and some novelty toys, which have a more obvious function or entertainment value, have been based on these simple "useless machines".
The Italian artist Bruno Munari began building "useless machines" (macchine inutili) in the 1930s. He was a "third generation" Futurist and did not share the first generation's boundless enthusiasm for technology, but sought to counter the threats of a world under machine rule by building machines that were artistic and unproductive.
The version of the useless machine that became famous in information theory (basically a box with a simple switch which, when turned "on", causes a hand or lever to appear from inside the box that switches the machine "off" before disappearing inside the box again) appears to have been invented by MIT professor and artificial intelligence pioneer Marvin Minsky, while he was a graduate student at Bell Labs in 1952. Minsky dubbed his invention the "ultimate machine", but that sense of the term did not catch on. The device has also been called the "Leave Me Alone Box".
Minsky's mentor at Bell Labs, information theory pioneer Claude Shannon (who later also became an MIT professor), made his own versions of the machine. He kept one on his desk, where science fiction author Arthur C. Clarke saw it. Clarke later wrote, "There is something unspeakably sinister about a machine that does nothing—absolutely nothing—except switch itself off", and he was fascinated by the concept.
In the 1960s, a novelty toy maker called "Captain Co." sold a "Monster Inside the Black Box", featuring a mechanical hand that emerged from a featureless plastic black box and flipped a toggle switch, turning itself off. This version may have been inspired in part by "Thing", the disembodied hand featured in the television sitcom The Addams Family. Other versions have been produced. In their conceptually purest form, these machines do nothing except switch themselves off.
It is claimed that Don Poynter, who graduated from the University of Cincinnati in 1949 and founded Poynter Products, Inc., first produced and sold the "Little Black Box", which simply switched itself off. He then added the coin snatching feature, dubbed his invention "The Thing", arranged licensing with the producers of the television show, The Addams Family, and later sold "Uncle Fester's Mystery Light Bulb" as another show spinoff product. Robert J. Whiteman, owner and president of Liberty Library Corporation, also claims credit for developing "The Thing". (Both companies were later to be co-defendants in landmark litigation initiated by Theodor Geisel ("Dr. Seuss") over copyright issues related to figurines.)
Both the plain black box and the bank version were widely sold by Spencer Gifts, and appeared in its mail-order catalogs through the 1960s and early 1970s. As of 2015[update], a version of the coin snatching black box is being sold as the "Black Box Money Trap Bank" or "Black Box Bank".
Do-it-yourself versions of the useless machine (often modernized with microprocessor controls) have been featured in a number of web videos and inspired more complex machines that are able to move or which use more than one switch. As of 2015[update], there are several completed or kit form devices being offered for sale.
In 2009, the artist David Moises exhibited his reconstruction of The Ultimate Machine aka Shannon's Hand, and explained the interactions of Claude Shannon, Marvin Minsky, and Arthur C. Clarke regarding the device.
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