Faça-se a Luz (et facta est lux)

Primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarisation, while its speed in a vacuum, 299,792,458 meters per second (about 300,000 kilometers per second), is one of the fundamental constants of nature.

Cities in dialogue

• Photo 1: (Fiat lux  |  London  |  R.Cambusano )
• Photo 2: (blue light_in  |  London  | R.Cambusano )
• Photo 3: (facta est lux.   |  London  |  R.Cambusano )
• Photo 4: (The Regular Laws of the Universe | London | Jaime Scatena)
• Photo 5 (luz | Porto Alegre | Gabriela Canale)
• Text 1: (Light properties | Wikipedia | Jaime Scatena)
• Photos 6,7,8,9 (Searching his way 1-4 | Nantes (France) | Yannick Marty | Nantes (France) | Yannick Marty)
• Photo 10 and Video:(Luz 8 | Jaguariúna | TIago Spina)
• Photo11 (Lux et luX|Buenos Aires|María Eugenia Arostegui
  Sebastian)