A Jacob's ladder (also magic tablets, Chinese blocks, and klick-klack toy [1] ) is a folk toy consisting of blocks of wood held together by strings or ribbons. When the ladder is held at one end, blocks appear to cascade down the strings. This effect is a visual illusion which is the result of one block after another flipping over. It may be considered a kinetic illusion, where the blocks appear to change position when they do not. [1] Its name Jacob's Ladder comes from the biblical ladder to heaven, mentioned in Genesis 28:12. [1]
Of unknown origin, the earliest known review of the Jacob's Ladder is an 1889 Scientific American article which tells how it is built and works: [1]
The simple toy ... is very illusive in action. When the upper block is grasped by the edges ... and turned so as to lift the second block in the series to the same height, the upper end of the second block falls into an inverted position, and appears to pass downward on the other members of the series, first upon one side of the ladder and then upon the other until it reaches the bottom. But this effect is only apparent, as the second block in reality only falls back into its original position in the series; but in the operation it becomes reversed, what was before the lower end becoming the upper end, the front having exchanged places with the back. This change of position of the second member brings it parallel with the third block, which is then released, and the third member drops over onto the fourth, when the fifth block is released, and so on throughout the entire series.
— "Jacob's Ladder", Scientific American, Vol. 61, No. 15 (October 1889) [2]
An arrangement of interlaced ribbons allows each block to act as if hinged to the next one at either of its two ends. The same mechanism is used in the 1980s toy Rubik's Magic, [3] but with plastic filaments run diagonally across squares, with the result that the squares can hinge along either of two adjacent sides.
In Fig. 2 are shown the three upper blocks of the series, 1, 2, and 3, and their connecting tapes, the blocks being represented as transparent and separated from each other a short distance to show the arrangement of the connections. Block 1 has attached to it three tapes, a, b, b. The tape, a, is attached to the face of the block at the center, at the upper end, and extends over the rounded end of this block and under the rounded end of block 2. The tapes, b, b, are attached to the face of block 1, extending downwardly under the lower end of this block and upwardly over the upper end of block 2. The tape, a, which is attached to the center of the upper face of block 2, extends over the end of this block, downward underneath, the block, and over the upper end of block 3, where it is secured. This arrangement of tapes is observed throughout the entire series.
— Scientific American [2]
The toy has been variously described as originating in China, [4] as being found in Tutankhamun's tomb, [5] [6] and as one of the few toys allowed on Sunday by Puritans in colonial America; [7] [ self-published source ] however, the true origins of the toy are unknown. [1]
Many slight variants have been patented in the United States, one from the 1940s having in one block an indentation to hold a penny, which then appeared to dis- and re-appear. [1] The Japanese polymath Hiraga Gennai (1728–1780) constructed a Jacob's ladder which later came to be called "Gennai's Wondrous Click-clack" (Gennai no fushigina katakata, 源内の不思議なカタカタ).[ citation needed ]
Howard Carter was a British archaeologist and Egyptologist who discovered the intact tomb of the 18th Dynasty Pharaoh Tutankhamun in November 1922, the best-preserved pharaonic tomb ever found in the Valley of the Kings.
The Rubik's Cube is a 3D combination puzzle invented in 1974 by Hungarian sculptor and professor of architecture Ernő Rubik. Originally called the Magic Cube, the puzzle was licensed by Rubik to be sold by Pentangle Puzzles in the UK in 1978, and then by Ideal Toy Corp in 1980 via businessman Tibor Laczi and Seven Towns founder Tom Kremer. The cube was released internationally in 1980 and became one of the most recognized icons in popular culture. It won the 1980 German Game of the Year special award for Best Puzzle. As of January 2024, around 500 million cubes had been sold worldwide, making it the world's bestselling puzzle game and bestselling toy. The Rubik's Cube was inducted into the US National Toy Hall of Fame in 2014.
Tutankhamun or Tutankhamen, was an ancient Egyptian pharaoh who ruled c. 1332 – 1323 BC during the late Eighteenth Dynasty of ancient Egypt. Born Tutankhaten, he was likely a son of Akhenaten, thought to be the KV55 mummy. His mother was identified through DNA testing as The Younger Lady buried in KV35; she was a full sister of her husband.
In geometry, flexagons are flat models, usually constructed by folding strips of paper, that can be flexed or folded in certain ways to reveal faces besides the two that were originally on the back and front.
The ulna or ulnar bone is a long bone in the forearm stretching from the elbow to the wrist. It is on the same side of the forearm as the little finger, running parallel to the radius, the forearm's other long bone. Longer and thinner than the radius, the ulna is considered to be the smaller long bone of the lower arm. The corresponding bone in the lower leg is the fibula.
KV55 is a tomb in the Valley of the Kings in Egypt. It was discovered by Edward R. Ayrton in 1907 while he was working in the Valley for Theodore M. Davis. It has long been speculated, as well as much disputed, that the body found in this tomb was that of the famous king, Akhenaten, who moved the capital to Akhetaten. The results of genetic and other scientific tests published in February 2010 have confirmed that the person buried there was both the son of Amenhotep III and the father of Tutankhamun. Furthermore, the study established that the age of this person at the time of his death was consistent with that of Akhenaten, thereby making it almost certain that it is Akhenaten's body. However, a growing body of work soon began to appear to dispute the assessment of the age of the mummy and the identification of KV55 as Akhenaten.
The tomb of Tutankhamun, also known by its tomb number, KV62, is the burial place of Tutankhamun, a pharaoh of the Eighteenth Dynasty of ancient Egypt, in the Valley of the Kings. The tomb consists of four chambers and an entrance staircase and corridor. It is smaller and less extensively decorated than other Egyptian royal tombs of its time, and it probably originated as a tomb for a non-royal individual that was adapted for Tutankhamun's use after his premature death. Like other pharaohs, Tutankhamun was buried with a wide variety of funerary objects and personal possessions, such as coffins, furniture, clothing and jewelry, though in the unusually limited space these goods had to be densely packed. Robbers entered the tomb twice in the years immediately following the burial, but Tutankhamun's mummy and most of the burial goods remained intact. The tomb's low position, dug into the floor of the valley, allowed its entrance to be hidden by debris deposited by flooding and tomb construction. Thus, unlike other tombs in the valley, it was not stripped of its valuables during the Third Intermediate Period.
Hiraga Gennai was a Japanese polymath and rōnin of the Edo period. He was a pharmacologist, student of Rangaku, physician, author, painter and inventor well known for his Erekiteru, Kandankei (thermometer) and Kakanpu. Gennai composed several works of literature, including the fictional satires Fūryū Shidōken den (1763), the Nenashigusa (1763), and the Nenashigusa kohen (1768), and the satirical essays On Farting and A Lousy Journey of Love. He also authored two guidebooks on the male prostitutes of Japan, the Kiku no en (1764) and the San no asa (1768). His birth name was Shiraishi Kunitomo, but he later used numerous pen names, including Kyūkei (鳩渓), Fūrai Sanjin (風来山人), Tenjiku rōnin (天竺浪人) and Fukuchi Kigai (福内鬼外). He is best known by the name Hiraga Gennai.
The Simple Magnetic Overunity Toy (SMOT) is a 1985 invention by Greg Watson from Australia that claims to show "over-unity" energy — that is, it supposedly produces more energy than it consumes, a perpetual motion machine. It is a type of magnet motor.
Horemheb, also spelled Horemhab, Haremheb or Haremhab, was the last pharaoh of the 18th Dynasty of Egypt. He ruled for at least 14 years between 1319 BC and 1292 BC. He had no relation to the preceding royal family other than by marriage to Mutnedjmet, who is thought to have been the daughter of his predecessor, Ay; he is believed to have been of common birth.
Ernő Rubik is a Hungarian inventor. He is best-known for creating the Rubik's Cube (1974), Rubik's Magic, Rubik's Magic: Master Edition, and Rubik's Snake.
Rubik's Magic, like the Rubik's Cube, is a mechanical puzzle invented by Ernő Rubik and first manufactured by Matchbox in the mid-1980s.
Jacob's Ladder is a staircase to heaven from a dream of Jacob described in the Old Testament.
The phenakistiscope was the first widespread animation device that created a fluent illusion of motion. Dubbed Fantascope and Stroboscopische Scheiben by its inventors, it has been known under many other names until the French product name Phénakisticope became common. The phenakistiscope is regarded as one of the first forms of moving media entertainment that paved the way for the future motion picture and film industry. Similar to a GIF animation, it can only show a short continuous loop.
David Breyer Singmaster was an American-British mathematician who was emeritus professor of mathematics at London South Bank University, England. He had a huge personal collection of mechanical puzzles and books of brain teasers. He was most famous for being an early adopter and enthusiastic promoter of the Rubik's Cube. His Notes on Rubik's "Magic Cube" which he began compiling in 1979 provided the first mathematical analysis of the Cube as well as providing one of the first published solutions. The book contained his cube notation which allowed the recording of Rubik's Cube moves, and which quickly became the standard.
Rubik, the Amazing Cube is a 1983 half-hour Saturday morning animated series based on the puzzle created by Ernő Rubik, produced by Ruby-Spears Enterprises and broadcast as part of The Pac-Man/Rubik, the Amazing Cube Hour block on ABC from September 10 to December 10, 1983 and continued in reruns until September 1, 1984. The Rubik half hour was broadcast in reruns as a standalone series on ABC from May 4 to August 31, 1985.
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The Guillotine is a magic trick where it appears that a blade of a guillotine passes through a person's neck without harming them. Variations on the theme have been performed for hundreds of years, with documented examples appearing in print in the 16th century. The most common modern variation is the finger guillotine or finger chopper, a pocked-sized version that appears to chop off the magician's finger.
The Anubis Shrine was part of the burial equipment of the 18th Dynasty pharaoh Tutankhamun, whose tomb in the Valley of the Kings was discovered almost intact in 1922 by Egyptologists led by Howard Carter. Today the object, with the find number 261, is on display at the Egyptian Museum in Cairo, with the inventory number JE 61444.