I really am very pleased and happy that the community has joined so massively #celestialchallenge I think we all owe a huge thank you for this @sirknight initiative the support of @steemchurch community and all the who are behind this challenge that we do not know. For my entry on Wednesday - Structures

The Louvre Museum preserves one of the best and widest collections of art. Built from 1200 as a fortress, and enlarged in 1500 as a palace, it was converted into a museum in 1793, being renovated every so often since then. The Grande Galerie is the main painting room of the Museum. It deals with the realization of an old project that consists of converting the whole museum into its museum function, at the same time as modernizing it by improving the presentation of its collections. Installed over an area of ​​more than 40 hectares in the heart of Paris, on the right bank of the Seine, the Musée du Louvre offers more than 60,000 m2 of exhibition halls devoted to the conservation of objects representing 11 millennia of civilization and culture. The Grand Louvre is also a cultural group that has a didactic mission with respect to the public, which meets through conferences, audiovisual and interactive productions, and several printed publications available in the rooms or in the bookshop that is under the pyramid .

Leoh Ming Pei (April 26, 1917) is an American architect of Chinese origin, and one of the most innovative and prolific of the twentieth century. In his work the concern for formal elegance and for the effectiveness of the function is appreciated. He was born in Canton, in China. Finished his school studies, at age 18 he moved to the United States to study architecture. He managed to enroll in the prestigious Massachusetts Institute of Technology (MIT), where he graduated in 1940. Between 1945 and 1948 he expanded his training teaching at Harvard as an assistant professor, under the tutelage of two famous European architects, Marcel Breuer and Walter Gropius. As a result, Pei is considered one of the American successors of the great masters of European architecture.

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In 1955 Pei adopted the American nationality and the following year he founded his own architecture firm, I. M. Pei & Partners. In its projects Pei looks for the purity of lines, together with a functional efficiency, following the so-called "international style" and the criteria of Gropius. He frequently uses abstract forms, resorts to cold materials, such as steel, cement and glass, and incorporates effects that are impressive for the observer. His works are often characterized by structures that require courageous solutions. Pei is one of the most appreciated architects of our time. He has done projects in places spread all over the planet. His work was recognized in 1983, the year in which he received the Pritzker Prize, the most prestigious award in international architecture. He has also received the Gold Medal of the American Institute of Architects, and many other distinctions.

Description

Stairs
The staircase with glass sill and stainless steel handrail, which seems to float freely in space, resembles the propeller of a ship. For it the visitor descends about 9 meters to the reception room of the Grand Louvre, located below the Cour Napoléon, or the "Napoleon Hall". Several services installed in that place, such as information, restaurants, cloakrooms, auditorium and a commercial space, offer the visitor of the Louvre the possibility of an optimal preparation for the tour of the museum.

The light
Both natural and artificial, played a very important role in the planning of the pyramid. It was intended that the visitor did not have the feeling of being inside an underground work. The lighting solution for this problem was to illuminate the supporting structure below the glass surface. With the help of the light sources used, this steel bearing structure must have a bright appearance; the amount of light, on the other hand, would be only a secondary aspect. Such a requirement imposed the need for a linear arrangement of point lights. For this purpose, adjustable projectors were used, with halogen reflector lamps of 100 W and intensive beam, which were placed along the base of the pyramid.

Data:

• Height of the pyramid: 21.65 m
• Length of the base side of the pyramid: 35 m
• Tilt angle: 51.7 degrees
• Crystals: 675 rhombuses of glass in the measures 3.00 m x 1.80 m. Each of the diamonds weighs 150 kg. In addition to it 118 triangles
• Support structure: 6000 beams (between 58 and 90 mm), 2100 knots
• Weight of the load-bearing structure: 95 tons
• Total weight of the pyramid: about 180 tons

• Architect: Ieoh Ming Pei & Partners, New York
• Local executing architects: Georges Duval and Michael Macary
• Project management: Yann Weymouth, Washington
• Lighting planning: Claude and Danielle Engle, Washington
• Static: Sogelerg, Rungis, Serete, Paris
• Construction contractor: Compagnie Francaise d'Entreprises Métalliques, Paris
• Coordination: Planitec, Paris

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Controversy

Since its construction, the pyramid has been subject to controversy, due to the contrast of styles between the modernity of glass and the museum's classicism, although it has served as inspiration for the extensions of many other museums. It has been described by some detractors as part of Mitterrand's "pharaoh complex". Others praise the juxtaposition of the contrast between architectural styles as a successful combination of the old and the new, the classic and the ultramodern.

The main pyramid is currently the largest of several glass pyramids built near the museum, including the inverted pyramid (La Pyramide Inversée) that functions as a skylight in an underground shopping center in front of the museum. During the design phase, it was proposed that the design include a needle in the pyramid to simplify window cleaning. This proposal was eliminated due to objections by I. M. Pei.

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For more information you can visit the following links:
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Thanks to @sirknight @steemchurch for how far he brought the #celestialchallenge.

• Sunday - Light
• Monday - Darkness
• Tuesday - Animal Kingdom
• Wednesday - Structures
• Thursday - Forces in Nature
• Friday - LoveBeauty Freedom
• Saturday - Agriculture

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