A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda next to the Houses of Parliament, London, Tuesday, Aug. 5, 2014.

A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda next to the Houses of Parliament, London, Tuesday, Aug. 5, 2014.

 A pedestrian walks underneath a disused railway bridge on St. Pancras Way, northwest London, Monday, June 27, 2011.

A pedestrian walks underneath a disused railway bridge on St. Pancras Way, northwest London, Monday, June 27, 2011.

 Smoke rises from locomotives operating within the opencast coal mine in Zhalainuer, Inner Mongolia, China, Tuesday, March 24, 2009.

Smoke rises from locomotives operating within the opencast coal mine in Zhalainuer, Inner Mongolia, China, Tuesday, March 24, 2009.

 Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

 People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

 An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009.

An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009.

 A man looks out of the window of a train running between Aranyaprathet and Bangkok, Thailand, Monday, Nov. 25, 2013.

A man looks out of the window of a train running between Aranyaprathet and Bangkok, Thailand, Monday, Nov. 25, 2013.

 India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble. 

India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble. 

 Pedestrians are illuminated by light reflecting from a nearby building on a crisp winter day as they walk past trees denuded of their leaves in central London, Sunday, Jan. 15, 2012.

Pedestrians are illuminated by light reflecting from a nearby building on a crisp winter day as they walk past trees denuded of their leaves in central London, Sunday, Jan. 15, 2012.

 A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009.

A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009.

 A jogger runs underneath trees bearing autumnal colors as they are shrouded in mist on Hampstead Heath, London, Tuesday, Oct. 23, 2012.

A jogger runs underneath trees bearing autumnal colors as they are shrouded in mist on Hampstead Heath, London, Tuesday, Oct. 23, 2012.

 Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

 A man inspects a pigeon handed to him by a street vendor on a road near the Jama Masjid mosque in New Delhi, India, Sunday, March 27, 2011.

A man inspects a pigeon handed to him by a street vendor on a road near the Jama Masjid mosque in New Delhi, India, Sunday, March 27, 2011.

 An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

 A family sit on the grass as the sun sets near Rashtrapati Bhawan, the Presidential Palace, New Delhi, Monday, March 21, 2011.

A family sit on the grass as the sun sets near Rashtrapati Bhawan, the Presidential Palace, New Delhi, Monday, March 21, 2011.

 A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

 A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

 A Darfuri woman holds a baby following rehearsals for independence celebrations in Juba, southern Sudan, Tuesday, July 5, 2011. Southern Sudan is set to declare independence from the north on Saturday, July 9. 

A Darfuri woman holds a baby following rehearsals for independence celebrations in Juba, southern Sudan, Tuesday, July 5, 2011. Southern Sudan is set to declare independence from the north on Saturday, July 9. 

 Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of southern Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011.

Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of southern Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011.

 Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010.

Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010.

 Pedestrians are reflected in a puddle as they walk underneath the Eiffel Tower in Paris, Thursday, July 15, 2006. 

Pedestrians are reflected in a puddle as they walk underneath the Eiffel Tower in Paris, Thursday, July 15, 2006. 

 Towns and villages emit light visible through a layer of cloud covering the Lake Geneva region as the Mont Blanc massif is visible in background at center right, as seen from 1,528 meters (5,013 feet) above sea level at La Barillette in the Jura mountains, western Switzerland, Thursday, Nov. 15, 2012.

Towns and villages emit light visible through a layer of cloud covering the Lake Geneva region as the Mont Blanc massif is visible in background at center right, as seen from 1,528 meters (5,013 feet) above sea level at La Barillette in the Jura mountains, western Switzerland, Thursday, Nov. 15, 2012.

 A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda next to the Houses of Parliament, London, Tuesday, Aug. 5, 2014.
 A pedestrian walks underneath a disused railway bridge on St. Pancras Way, northwest London, Monday, June 27, 2011.
 Smoke rises from locomotives operating within the opencast coal mine in Zhalainuer, Inner Mongolia, China, Tuesday, March 24, 2009.
 Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.
 People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.
 An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009.
 A man looks out of the window of a train running between Aranyaprathet and Bangkok, Thailand, Monday, Nov. 25, 2013.
 India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble. 
 Pedestrians are illuminated by light reflecting from a nearby building on a crisp winter day as they walk past trees denuded of their leaves in central London, Sunday, Jan. 15, 2012.
 A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009.
 A jogger runs underneath trees bearing autumnal colors as they are shrouded in mist on Hampstead Heath, London, Tuesday, Oct. 23, 2012.
 Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.
 A man inspects a pigeon handed to him by a street vendor on a road near the Jama Masjid mosque in New Delhi, India, Sunday, March 27, 2011.
 An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.
 A family sit on the grass as the sun sets near Rashtrapati Bhawan, the Presidential Palace, New Delhi, Monday, March 21, 2011.
 A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.
 A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.
 A Darfuri woman holds a baby following rehearsals for independence celebrations in Juba, southern Sudan, Tuesday, July 5, 2011. Southern Sudan is set to declare independence from the north on Saturday, July 9. 
 Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of southern Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011.
 Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010.
 Pedestrians are reflected in a puddle as they walk underneath the Eiffel Tower in Paris, Thursday, July 15, 2006. 
 Towns and villages emit light visible through a layer of cloud covering the Lake Geneva region as the Mont Blanc massif is visible in background at center right, as seen from 1,528 meters (5,013 feet) above sea level at La Barillette in the Jura mountains, western Switzerland, Thursday, Nov. 15, 2012.

A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda next to the Houses of Parliament, London, Tuesday, Aug. 5, 2014.

A pedestrian walks underneath a disused railway bridge on St. Pancras Way, northwest London, Monday, June 27, 2011.

Smoke rises from locomotives operating within the opencast coal mine in Zhalainuer, Inner Mongolia, China, Tuesday, March 24, 2009.

Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009.

A man looks out of the window of a train running between Aranyaprathet and Bangkok, Thailand, Monday, Nov. 25, 2013.

India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble. 

Pedestrians are illuminated by light reflecting from a nearby building on a crisp winter day as they walk past trees denuded of their leaves in central London, Sunday, Jan. 15, 2012.

A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009.

A jogger runs underneath trees bearing autumnal colors as they are shrouded in mist on Hampstead Heath, London, Tuesday, Oct. 23, 2012.

Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

A man inspects a pigeon handed to him by a street vendor on a road near the Jama Masjid mosque in New Delhi, India, Sunday, March 27, 2011.

An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

A family sit on the grass as the sun sets near Rashtrapati Bhawan, the Presidential Palace, New Delhi, Monday, March 21, 2011.

A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

A Darfuri woman holds a baby following rehearsals for independence celebrations in Juba, southern Sudan, Tuesday, July 5, 2011. Southern Sudan is set to declare independence from the north on Saturday, July 9. 

Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of southern Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011.

Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010.

Pedestrians are reflected in a puddle as they walk underneath the Eiffel Tower in Paris, Thursday, July 15, 2006. 

Towns and villages emit light visible through a layer of cloud covering the Lake Geneva region as the Mont Blanc massif is visible in background at center right, as seen from 1,528 meters (5,013 feet) above sea level at La Barillette in the Jura mountains, western Switzerland, Thursday, Nov. 15, 2012.

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