Since installations is a 3-d art and not constrained to be finished by paints or brushes, one can always see some examples of installations that can escape the constraint of galleries and often they are able to use inter-media to complete the artwork.
One of the prime example I remember from class is the pink neon light. As simple as a light, which space and where exactly it is placed can help the installation reach a whole new level. The artist would use the space closely with the installation to either convey a distinctive message brought by the relation between the work and the space or to boost the work. As in this case, when the pink neon light is placed in the corner of a blank white wall, the work is boosted as the pink light emerged from the light is more focused, visible and brighter than it is when it's hanged openly up in the ceiling. Thus, the relation between art and space is tied closely in this type of artwork and we can see how art is nondetachable from everyday life.
Apart from using the space to help creating the art, another point I have learned about installation art is that how it can interact with the space. One of the examples is land art. Artists would choose a particular space for the installation. If the placed is changed, the meaning would also be changed and may not convey the artist's initial intention. Let's looks at the example below to discuss the point.
This picture shows an installation made by the artist Martin Hill. A semi circular sculpture is placed in the middle of a lake and the sun causes reflection on the silver semi circular sculpture, causing it forms a colorful reflection on the sculpture and in the water making it looks like a complete circle. This artwork wants to bring out the message of the beauty of nature as well as the relationship between human and natural systems that how they can help to improve it through the way they live their lives. If the artwork is not interacting with this particular space - a lake with sun shining on top, then the other half semi-circle reflection may not appear and the whole meaning and message of the artwork will disappear.
From using the space to help to boost the artwork to interacting with the space to convey the message of the installation, installation art is all about the space and it reminds us again of how art and life is truly inseparable.
