Created in 2006 by multidisciplinary artist Kimsooja, To Breathe – A Mirror Woman was an elaborate installation at the Palacio de Cristal, Parque del Retiro, in Madrid. Originally built in the late 1880s to house a collection of flora and fauna from the Philippines, Kimsooja transformed the Palacio de Cristal into a multisensory sound and light experience. A special translucent diffraction film was used to cover the windows to create an array of naturally occurring rainbows which were in turn reflected by a mirrored surface that covered the entire floor. Additionally, an audio recording of the artist breathing was played throughout the space to further enhance the experience. The installation was on view through the end of the summer and you can read much more about it here.