Staircase
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A staircase or stairway is a flight or series of flights of stairs. It is used to connect walkways between floors so that one can move in height. A stairwell is a shaft in a building where a staircase
Stairway with skylight
Spiral staircase (double helix) in the Vatican Museums
Spiral staircase in Riga (Art Nouveau)
Escape route via stairs with open steps
Skylight
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A skylight is a light-permitting structure or window, usually made of glass or translucent plastic, that forms all or part of the roof space of a building for daylighting.
Staircase
…access to a wall on the outside where it would be natural to have a regular window for letting daylight in. For this reason, it is not unusual to find a skylight or roof windows above a stairwell. A research article suggests that perceived safety increases when using downwards lighting toward the stairs, while…
Skylight in the rotunda of Centro Cultural Banco do Brasil in Rio de Janeiro
Oculus of the Pantheon, Rome, an open skylight
Skylight in the vault in the Chapel of the Constable of the Burgos Cathedral, a glazed closed skylight from the 15th century
Solar-powered venting skylight in Southern California