Space will be influenced by light

Light plays a key role in the design of a visual environment,it has some influenced in architecture.
In the first place,light defines spaces and boundaries.

source: http://www.thecoolhunter.net/cloud/view/Office
In the same space,light as the tool to boundaries space.For example in  above pictures, the extra lights help people recognize each zones.

In the second place,light accentuates and connects space.

The pantheon in Roman

The church of light 

         

Stone museum in Korea

In the third place,light is a visual task,providing enough light to recognize a
black space  or to be able to walk safely through a corridor.

Skylight staircase to gallery

                        Kunsthaus Bregenz,Austria

source:http://www.archdaily.com/457319/loft-mm-c-t-architects/

Lastly, light creates atmosphere.Different types of light can give people different feeling.Natural light projection and reflecting  in the space,not only the spatial variation of visual expression, but also create the emotion of space (Plummer,2009).Such as mysterious,

Chapel of St lgnatius

Ronchamp Chapel

holy,

Light of church

Silence

St Benedictusberg Abbey

Row house in sumiyoshi

Stone museum in Korea

References:

GINTHNER,D.,Lighting: Its Effect on People and Spaces [online].University of Minnesota.Available at:http://www.informedesign.org/_news/feb_v02-p.pdf [Accessed 13 December2013].

PLUMMER,H,.2009.The architecture of natural light.London:Thames and Hudson Ltd.