Installation Art!

From wikipedia: Installation art uses sculptural materials and other media to modify the way we experience a particular space. Installation art is not necessarily confined to gallery spaces and can be any material intervention in everyday public or private spaces.
Installation art incorporates almost any media to create an experience in a particular environment. Materials used in contemporary installation art range from everyday and natural materials to new media such as video, sound, performance, computers and the internet. Some installations are site-specific in that they are designed to only exist in the space for which they were created.

Stephen Reed:

Crayon Fence: (Don't know who it's by)

Louis Vuitton Fashion Installation Art:

Painted staircase (Don't know who it's by again..):