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Valencia (Spanish: [baˈlenθja]), or València (Valencian: [vaˈlensia]), is the capital of the autonomous community of Valencia and the third largest city in Spain after Madrid and Barcelona, with around 809,000 inhabitants in the administrative centre. Valencia is also Spain's third largest metropolitan area, with a population ranging from 1.7 to 2.5 million. The city has global city status. The Port of Valencia is the 5th busiest container port in Europe and the largest on the Mediterranean Sea, with a trade volume of 4.21 million TEU's.

Valencia was founded as a Roman colony in 138 BC. The city is situated on the banks of the Turia, on the east coast of the Iberian Peninsula, fronting the Gulf of Valencia on the Mediterranean Sea. Its historic centre is one of the largest in Spain, with approximately 169 acres; this heritage of ancient monuments, views and cultural attractions makes Valencia one of the country's most popular tourist destinations. Major monuments include Valencia Cathedral, the Torres de Serranos, the Torres de Quart, the Llotja de la Seda (declared a World Heritage Site by UNESCO in 1996), and the Ciutat de les Arts i les Ciències (City of Arts and Sciences), an entertainment-based cultural and architectural complex designed by Santiago Calatrava and Félix Candela. The Museu de Belles Arts de València houses a large collection of paintings from the 14th to the 18th centuries, including works by Velázquez, El Greco, and Goya, as well as an important series of engravings by Piranesi. The Institut Valencià d'Art Modern (Valencian Institute of Modern Art) houses both permanent collections and temporary exhibitions of contemporary art and photography.

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The City of Arts and Sciences (Valencian: Ciutat de les Arts i les Ciències), (Spanish: Ciudad de las Artes y las Ciencias) is an entertainment-based cultural and architectural complex in the city of Valencia, Spain. It is the most important modern tourist destination in the city of Valencia.

The City of Arts and Sciences is situated at the end of the former riverbed of the river Turia, which was drained and rerouted after a catastrophic flood in 1957. The old riverbed was turned into a picturesque sunken park.

Designed by Santiago Calatrava and Félix Candela, the project underwent the first stages of construction in July 1996 and the finished "city" was inaugurated April 16, 1998 with the opening of L'Hemisfèric. The last great component of the City of Arts and Sciences, El Palau de les Arts Reina Sofia, was presented on October 9, 2005, Valencian Community Day.

Santiago Calatrava Valls (Valencian pronunciation: [santiˈaɣo kalaˈtɾava ˈvaʎs], born 28 July 1951) is a Spanish architect, sculptor and structural engineer whose principal office is in Zürich, Switzerland. He has offices in Zürich, Paris, Valencia, and New York City (where he now resides).

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection.

In acoustics, reflection causes echoes and is used in sonar. In geology, it is important in the study of seismic waves. Reflection is observed with surface waves in bodies of water. Reflection is observed with many types of electromagnetic wave, besides visible light. Reflection of VHF and higher frequencies is important for radio transmission and for radar. Even hard X-rays and gamma rays can be reflected at shallow angles with special "grazing" mirrors.