What's happening is that sound is continuously traveling back and forth along the tube, due to the fact that the waves reflect off of each end. The sound is continuously being produced by the speaker, so as sound traveling in one direction along the tube encounters sound traveling in the opposite direction, the waves interfere with each other. In places where two high-pressure regions overlap we get constructive interference and the wave amplitude increases. 

If you generate sound at the right frequencies for the length of tube that you have, you can generate standing waves, where the locations for constructive and destructive interference always occur at the same place, forming a standing pattern. The distance between the standing wave peaks is the wave length of the sound at that frequency.

Steampunk most recognisably features are anachronistic technologies or retro-futuristic inventions as people in the 19th century might have envisioned them, and is likewise rooted in the era's perspective on fashion, culture, architectural style, and art.Such technology may include fictional machines like those found in the works of H.G. Wells and Jules Verne, or of the modern authors Phillip Pullman, Scott Westerfeld, Stephen Hunt, and China Miéville. Other examples of steampunk contain alternative-history-style presentations of such technology as steam cannons, lighter-than-air airships, analogue computers, or such digital mechanical computers as Charles Babbage's Analytical Engine.

Steampunk may also incorporate additional elements from the genres of fantasy, horror, historical fiction, alternate history, or other branches of speculative fiction, making it often a hybrid gender. The first known appearance of the term steampunk was in 1987, though it now retroactively refers to many works of fiction created as far back as the 1950s or 1960s.

Steampunk also refers to any of the artistic styles, clothing fashions, or subcultures that have developed from the aesthetics of steampunk fiction, Victorian-era fiction, art nouveau design, and films from the mid-20th century.Various modern utilitarian objects have been modded by individual artisans into a pseudo-Victorian mechanical "steampunk" style, and a number of visual and musical artists have been described as steampunk.

 This story is not always consider a Steampunk, but it has all the right styles and themes, and was really quite an inspiration for the more modern styles of steampunk in movies and in crafted items. It has a big level of influence and reference in the realm of later steampunk.

Van Helsing is out to get Count Dracula with the help of a gypsy Princess by order of the Vatican. This movie is big in the Steampunk movies world and one of the most characteristic part of it are the costumes.

At first, it passes itself off for cute fiction but it's quite a dark story based in a world full of scientific rules and complex scientific machines, even flying ones, which are quite a hallmark of steampunk. Even the story's name, the Golden Compass, which does dabble a bit at fantasy, draws it into the realm of steampunk.

It's got the whole steampunk aesthetic, because the story does not have a time period, and to make it timeless, they reached out to steampunk.

The comic was easily identifiable as steampunk, but a few people find it a bit of an anachronistic movie, or it showed things that didn't belong in the portrayed time, although that is almost the whole point of steampunk.

Atlantis: a Lost Empire is a bit of a cross between fantasy and steampunk. Although the magic in the movie make it tends to fantasy, the machines that are powered by that magic and the whole “Ruin” aspect of the city, has a Steampunk aesthetic. Most importantly, the machines used to reach Atlantis are steam powered, from drilling trucks, and even a balloon machine at the end, this is mostly a steam powered movie. Some of the characters even have genre correct outfits.

This movie has been deemed a 'steampunk fairytale'. Which is perfectly accurate, because for all the elements of steampunk it has in it, it is not dystopian in nature, it's actually a relatively happy movie. It can be thought of as an alternate history, if magic was also thrown into things. Despite magic being the true power, everything in the movie that is technological looks entirely steam powered, simply magically provided steam. Cars of the non-magic steam powered variety are also readily visible in the movie.

This movie was originally based lightly around the book "Treasure Island”, but this animation lends itself amazingly well to the addition of crazy technology, and flying space ships that look like classic pirate ships. The adaptation even includes a villain with a very steampunk arm, full of changeable technology and period clothing on everyone, it's a perfect integration of steampunk into classic novels.

This movie is a post apocalyptic nightmare, in which an animate ragdoll, the ninth one must save what remains of humanity, which only he holds the key to. The most telling thing that points to steampunk, after the post-apocalyptic world, are the villainous machines that are after him, which look like they were pulled out of a steampunk machine nightmare, mixing organic parts, skulls, and technology.

This features a young orphan living in the walls of a Paris train station, maintaining the clocks while also repairing an automaton, desperate to learn what it did when working, and what the importance of it was to his father. It's based in the 1930's, and it's all about watching metal come to life.

 

There are many varieties of board games. Their representation of real-life situations can range from having no inherent theme, like checkers, to having a specific theme and narrative, like Cluedo. Rules can range from the very simple, like Tic-tac-toe, to those describing a game universe in great detail, like Dungeons & Dragons – although most of the latter are role-playing games where the board is secondary to the game, serving to help visualize the game scenario. The time required to learn to play or master a game varies greatly from game to game, but is not necessarily correlated with the number or complexity of rules; games like Chess or Go  possess relatively simple rulesets, but have great strategic depth. 

 

Board games have been played in most cultures and societies throughout history. A number of important historical sites, artifacts, and documents shed light on early board games such as Jiroft civilization gameboards in Iran. Senet, found in Predynastic and First Dynasty burials of Egypt, c. 3500 BC and 3100 BC respectively, is the oldest board game known to have existed. Senet was pictured in a Fresco found in Merknera's tomb (3300–2700 BC). Also from the predynastic Egypt is Mehen. Backgammon originated in ancient Persia over 5,000 years ago. Chess, Pachisi and Chaupar  originated in India. Go and Liubooriginated in China. Shax originated in Somalia. Bao (mancala game) is still played throughout eastern Africa. Patolli originated in Mesoamerica played by the ancient Aztec and TheRoyal Game of Ur was found in the Royal Tombs of Ur, dating to Mesopotamia 4,600 years ago. The earliest known games list is the Buddha games list.

 

The late 1990s onwards have seen substantial growth in the reach and market of board games. This has been attributed to, among other factors, the Internet, which has made it easier for people to find out about games and to find opponents to play against.Around the year 2000 the board gaming industry began significant growth with companies producing a rising number of games to be sold to a growing worldwide audience. In the 2010s, a number of publications reffered to the board games as having a new Golden Age. Board game venues are also growing in popularity. Some games, such as chess, depend completely on player skill, while many children's games such as Candy Land and Snakes and Ladders require no decisions by the players and are decided purely by luck. Many games require some level of both skill and luck. A player may be hampered by bad luck in backgammon, Monopoly, Risk, but over many games a skilled player will win more often, and the elements of luck can make for more excitement, and more diverse and multifaceted strategies, as concepts such as expected value and risk management must be considered. 

 

Another important aspect of some games is diplomacy, that is, players making deals with one another. Negotiation generally features only in games with three or more players, cooperative games being the exception. An important facet of The Settlers of Catan, for example, is convincing players to trade with you rather than with opponents. In Risk, two or more players may team up against others. Easy diplomacy involves convincing other players that someone else is winning and should therefore be teamed up against. Advanced diplomacy consists of making elaborate plans together, with the possibility of betrayal. In perfect information games, such as chess, each player has complete information on the state of the game, but in other games, such as Tigris and Euphrates or Stratego, some information is hidden from players. This makes finding the best move more difficult, and may involve estimating probabilities by the opponents. 

 

Many board games are now available as video games, which can include the computer playing as one or more opponents. Many board games can now be played online against a computer and/or other players. Some websites allow play in real time and immediately show the opponents' moves, while others use email to notify the players after each move. The Internet and cheaper home printing has also influenced board games via print-and-play games that may be purchased and printed. Some games use external media such as audio cassettes or DVDs in accompaniment to the game. 

 

There are also virtual tabletop programs that allow online players to play a variety of existing and new board games through tools needed to manipulate the game board, but do not necessarily enforce the game's rules, leaving this up to the players. There are generalized programs such as Vassal, Tabletop Simulator and Tabletopia that can be used to play any board or card game, while programs like Roll20 and Fantasy Grounds that are more specialized for role-playing games. Some of these virtual tabletops have worked with the license holders to allow for use of their game's assets within the program; for example, Fantasy Grounds has licenses for both Dungeons & Dragons and Pathfinder materials, while Tabletop Simulator has allows game published to provide paid downloadable content for their games. However, as these games offer the ability to add in content through user modifications, there are also unlicensed uses of board game assets available through these programs. 

 

A 1991 estimate for the global board game market was over $1.2 billion. A 2001 estimate for the United States "board games and puzzle" market gave a value of under $400 million, and for United Kingdom, of about £50 million. A 2009 estimate for the Korean market was put at 800 million won, and another estimate for the American board game market for the same year was at about $800 million. A 2011 estimate for the Chinese board game market was at over 10 billion yuan. (Some estimates may split board games from collectible card, miniature and role-playing games; for example another 2014 estimate distinguishing board games from other types of hobby games gave the estimate for the U.S. and Canada market at only $75 million, with the total size of what it defined as the hobby game market at over $700 million, with a 2015 estimate suggesting a value of almost $900 million) A 2013 estimate put the size of the German toy market at 2.7 billion euros (out of which, the board games and puzzle market is worth about 375 million euros), and Polish markets, at 2 billion and 280 million zlotis, respectively. Per capita, in 2009 Germany was considered to be the best market, with the highest number of games sold per individual. 

 

A dedicated field of research into gaming exists, known asgame studies or ludology. While there has been a fair amount of scientific research on the psychology of older board games, less has been done on contemporary board games such as Monopoly, Scrabble, and Risk. Much research has been carried out on chess, in part because many tournament players are publicly ranked in national and international lists, which makes it possible to compare their levels of expertise. The works of Adriaan de Groot, William Chase, Herbert A. Simon, and Fernand Gobet have established that knowledge, more than the ability to anticipate moves, plays an essential role in chess-playing. 

 

Linearly arranged board games have been shown to improve children's spatial numerical understanding. This is because the game is similar to a number line in that they promote a linear understanding of numbers rather than the innate logarithmic one. Research studies show that board games such as Snakes and Ladders result in children showing significant improvements in aspects of basic number skills such as counting, recognizing numbers, numerical estimation and number comprehension. They also practice fine motor skills each time they grasp a game piece. Playing board games has also been tied to improving children's executive functions. Related to this is a growing academic interest in the topic of game accessibility, culminating in the development of guidelines for assessing the accessibility of modern tabletop games and the extent to which they are playable for people with disabilities. 

This is the last known major work in Leonardo's hand. The figure's haunting beauty comes from the ambiguity of its sexual identity. The luminous face seems to be an emanation of the darkness that completely envelops it. The mysterious gesture of the raised arm with upward-pointing finger is not just of religious but probably also of esoteric significance.

Géricault chose to depict this event in order to launch his career with a large-scale uncommissioned work on a subject that had already generated great public interest. The event fascinated him, and before he began work on the final painting, he undertook extensive research and produced many preparatory sketches. He interviewed two of the survivors and constructed a detailed scale model of the raft. He visited hospitals and morgues where he could view, first-hand, the colour and texture of the flesh of the dying and dead. As he had anticipated, the painting proved highly controversial at its first appearance in the 1819 Paris Salon, attracting passionate praise and condemnation in equal measure. However, it established his international reputation, and today is widely seen as seminal in the early history of the Romantic movement in French painting.

Joachim Murat acquired the first version of the piece in 1800. After his death the statue entered the Louvre Museumin Paris, France in 1824. Prince Yusupov, a Russian nobleman acquired the 2nd version of the piece from Canova in Rome in 1796, and it later entered the Hermitage Museum in Saint Petersburg.

Today, examples of Smith’s work can be found at MoMA in New York, the Metropolitan Museum of Art, The Whitney Museum of American Art, the Guggenheim Museum, The National Gallery of Art, The Hirshhorn, the Walker Art Center, The New Jersey State Museum, the Newark Museum, the Montclair Art Museum, and the Nasher Sculpture Center. Cities where Smith’s work has been on public display include New York, Detroit, Princeton, Seattle, Minneapolis, San Antonio, Cambridge, Ottawa, Buffalo, Seoul, Dallas, Tokyo, Valencia, Boston, St. Louis, Louisville, Philadelphia, Cleveland, Pittsburgh, New Orleans, Toledo, Houston, Rochester, Washington, D.C., Baltimore, Oslo, Honolulu, Albany, Milwaukee, San Francisco, and Miami.

The name Silhouette is from Etienne de Silhouette, an eighteenth century French Minister of Finance to Louis XV. He hand cut out pensions and luxuries thus the term “cut out” or “minimal.“ Mr. Silhouette lasted a mere eight months at his post due to his “conservatism,“ and people would often dress entirely in black to protest his budget cuts. It is said that Silhouette would while away the hours in his office making these profile “shades” of the various heads of state, and place them on the mantle in his office for people to see.

Silhouette “shades” were the way to have a profile made without having to have an expensive portrait commissioned, and cost about a penny a piece. They were referred to as the “poor man’s portrait.”

It is likely that a man named August Edouart made the word "silhouette" popular when he came to England in 1829 from France. Edouart wanted to create the impression of something different, so he strove to distinguish his work from the popular "shade" which was often traced by machine, a method he found crude and without merit. 

From its heyday in the 18th century, the practice is waning, in part because there are only a few dozen silhouette artists of varying technical ability in the world.