A detail from the garbage disposal system at the Purple Level of the Mountain Dwellings building in Copenhagen, Denmark
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/27461854@N04">mcamcamca</a>
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/27461854@N04/3087359042/">Bjerget - Purple Level Garbage Chute</a>