From 24th May to 6th July 1975 the National Gallery of Canada held a major exhibition of paintings and three-dimensional objects by the American artist Donald Judd. The preparations for the exhibition involved the National Gallery Workshop and Restoration and Conservation Laboratory in both restorative and conservation treatments together with reconstructing several earlier works under the close supervision of the artist and Brydon Smith, Curator of Contemporary Art at the National Gallery of Canada. The involvement of the Restoration and Conservation Laboratory in the reconstruction of art objects deviates slightly from the more traditional function within a gallery but points to a necessary change in attitude when dealing with contemporary art.