Following the O'Kelly excavation, further restoration and reconstruction took place at the site. Based on the positions of the cobblestones, and after conducting experiments, O'Kelly concluded that they had made up a retaining wall, but had fallen from the face of the mound. As part of the restoration, this wall was "rebuilt" and the cobblestones were fixed into a near-vertical steel-reinforced concrete wall surrounding the front of the mound. This work is controversial among the archaeological community. P. R. Giot described the monument as looking like a "cream cheese cake with dried currants distributed about." Neil Oliver described the reconstruction as "a bit brutal, a bit overdone, kind of like Stalin does the Stone Age". Critics of the new wall claim that the technology to fix a retaining wall at this angle did not exist when the mound was created.