Greenlandic artist Inuk Silis Høegh’s Iluliaq (or Iceberg) completely covers the windows of the National Gallery of Canada's Great Hall as work is being done to replace them.

Over the course of the year, as the windows are replaced, Iluliaq will gradually "melt", beginning at the end of June and completely disappearing in December 2013.

Watch the above video to see a timelapse of the construction of the art installation.