Romanesque architecture varies in appearance of walls, piers , arches and openings, arcades , columns , vaults , and roofs and in the materials used to create these features. ... Columns were often used in Romanesque architecture, but varied in building material and decorative style.
The shutter is nothing more than a curtain inside the camera that opens and closes for light to reach the sensor (or film). The longer you open, the more light will come in, and the brighter the picture will be.
The time the shutter is open is measured by fractions of a second, seconds, minutes and even hours.