Orecchio di Dionisio Ear of Dionysius
Second name:	Ear of Dionigi
Country Country A country is a region legally identified as a distinct entity in political geography. A country may be an independent sovereign state or one that is occupied by another state, as a non-sovereign or formerly sovereign political division, or a geographic region associated with a previously... :	Italy Italy Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...
Region:	Sicily Sicily Sicily is a region of Italy, and is the largest island in the Mediterranean Sea. Along with the surrounding minor islands, it constitutes an autonomous region of Italy, the Regione Autonoma Siciliana Sicily has a rich and unique culture, especially with regard to the arts, music, literature,...
Province:	ile:Provincia di Syracuse Province of Syracuse The Province of Syracuse is a province in the autonomous island region of Sicily in Italy. Its capital is the city of Syracuse.It has an area of 2,109 km², and a total population of 396,167 ....
Municipality:	Syracuse
Coordinates Geographic coordinate system A geographic coordinate system is a coordinate system that enables every location on the Earth to be specified by a set of numbers. The coordinates are often chosen such that one of the numbers represent vertical position, and two or three of the numbers represent horizontal position... :	37°05′N 15°17′E
Time zone Time zone A time zone is a region on Earth that has a uniform standard time for legal, commercial, and social purposes. In order for the same clock time to always correspond to the same portion of the day as the Earth rotates , different places on the Earth need to have different clock times... :	CET Central European Time Central European Time , used in most parts of the European Union, is a standard time that is 1 hour ahead of Coordinated Universal Time . The time offset from UTC can be written as +01:00... , UTC+1 UTC+1 UTC+01:00 is an identifier for a time offset from UTC of +01:00. In ISO 8601 the associated time would be written as .This time is used in:*Central European Time*West Africa Time*Western European Summer Time**British Summer Time**Irish Standard Time...
Type:	Artificial limestone Limestone Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....  cave
Length Length In geometric measurements, length most commonly refers to the longest dimension of an object.In certain contexts, the term "length" is reserved for a certain dimension of an object along which the length is measured. For example it is possible to cut a length of a wire which is shorter than wire... :	60 m
Elevation Elevation The elevation of a geographic location is its height above a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface .... :	400 amsl Above mean sea level The term above mean sea level refers to the elevation or altitude of any object, relative to the average sea level datum. AMSL is used extensively in radio by engineers to determine the coverage area a station will be able to reach...
Depth:	? m
Website Website A website, also written as Web site, web site, or simply site, is a collection of related web pages containing images, videos or other digital assets. A website is hosted on at least one web server, accessible via a network such as the Internet or a private local area network through an Internet...	Orecchio di Dionisio

The Ear of Dionysius is an artificial limestone

Limestone

Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....

 cave carved out of the Temenites hill in the city of Syracuse

Syracuse, Italy

Syracuse is a historic city in Sicily, the capital of the province of Syracuse. The city is notable for its rich Greek history, culture, amphitheatres, architecture, and as the birthplace of the preeminent mathematician and engineer Archimedes. This 2,700-year-old city played a key role in...

, on the island of Sicily

Sicily

Sicily is a region of Italy, and is the largest island in the Mediterranean Sea. Along with the surrounding minor islands, it constitutes an autonomous region of Italy, the Regione Autonoma Siciliana Sicily has a rich and unique culture, especially with regard to the arts, music, literature,...

 in Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

. Its name comes from its similarity in shape to the human ear.

Geology

The Ear of Dionysius was most likely formed out of an old limestone quarry

Quarry

A quarry is a type of open-pit mine from which rock or minerals are extracted. Quarries are generally used for extracting building materials, such as dimension stone, construction aggregate, riprap, sand, and gravel. They are often collocated with concrete and asphalt plants due to the requirement...

. It is 23 metres high and extends 65 metres back into the cliff. Horizontally, it bends in an approximate "S" shape, vertically it is tapered at the top like a teardrop. Because of its shape the Ear has extremely good acoustics

Acoustics

Acoustics is the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics...

, making even a small sound resonate

Resonance

In physics, resonance is the tendency of a system to oscillate at a greater amplitude at some frequencies than at others. These are known as the system's resonant frequencies...

 throughout the cave.

History

The name of the cave was coined in 1586 by the painter

Painting

Painting is the practice of applying paint, pigment, color or other medium to a surface . The application of the medium is commonly applied to the base with a brush but other objects can be used. In art, the term painting describes both the act and the result of the action. However, painting is...

 Caravaggio

Caravaggio

Michelangelo Merisi da Caravaggio was an Italian artist active in Rome, Naples, Malta, and Sicily between 1593 and 1610. His paintings, which combine a realistic observation of the human state, both physical and emotional, with a dramatic use of lighting, had a formative influence on the Baroque...

. It refers to the tyrant Dionysius I of Syracuse

Dionysius I of Syracuse

Dionysius I or Dionysius the Elder was a Greek tyrant of Syracuse, in what is now Sicily, southern Italy. He conquered several cities in Sicily and southern Italy, opposed Carthage's influence in Sicily and made Syracuse the most powerful of the Western Greek colonies...

. According to legend

Legend

A legend is a narrative of human actions that are perceived both by teller and listeners to take place within human history and to possess certain qualities that give the tale verisimilitude...

 (possibly one created by Caravaggio), Dionysius used the cave as a prison

Prison

A prison is a place in which people are physically confined and, usually, deprived of a range of personal freedoms. Imprisonment or incarceration is a legal penalty that may be imposed by the state for the commission of a crime...

 for political dissidents, and by means of the perfect acoustics eavesdropped on the plans and secrets of his captives. Another more gruesome legend claims that Dionysius carved the cave in its shape so that it would amplify the screams of prisoners being tortured in it. Unfortunately, the sound focusing effect can no longer be heard because access to the focal point is no longer possible.

Because of its reputation for acoustic flawlessness, the Ear of Dionysius has also come to refer to a type of ear trumpet

Ear trumpet

Ear trumpets are tubular or funnel-shaped devices which collect sound waves and lead them into the ear. This results in a strengthening of the sound energy impact to the eardrum and thus a better hearing for a reduced or decreased hearing individual....

 that has a flexible tube. The term 'Ear of Dionysius' can also refer to surveillance, specifically that for political gain.

There is a strong possibility that this feature is actually of natural origin. It lies on the down slope side of a substantial hill it could well be a 'slot' canyon cut by rainwater run-off in prehistoric times. Comparing it to other 'slot' canyons, especially those in the state of Utah

Utah

Utah is a state in the Western United States. It was the 45th state to join the Union, on January 4, 1896. Approximately 80% of Utah's 2,763,885 people live along the Wasatch Front, centering on Salt Lake City. This leaves vast expanses of the state nearly uninhabited, making the population the...

(USA), it shows many similar characteristics. The narrowness of the top opening and widening of the lower part are also common to slot caverns elsewhere, as is its serpentine shape. The highly polished sides also suggest that the phenomenon was created by water. Such a natural feature, especially given its acoustics, would have been valued in the ancient world for its supposed sacred properties and this could have led to its preservation. Had it been man-made, why would the 'quarriers' bother to polish its walls to such a high degree, or remove stone in such an impractical fashion? Given that the building of the extensive Necropolis that abuts it on the hillside above involved removing a huge amount of the original overlaying rock, it is also possible that this 'canyon' extended even further before men began quarrying there.

External links

• Description of acoustics on Sound Tourism site