Sixteen years later, in 1998, both the head and face of Crazy Horse were completed and dedicated; Crazy Horse's eyes are 17 feet (5 m) wide while his head has an area of 87 feet (27 m).[15][16][17] Ruth Ziolkowski and seven of the Ziolkowskis' 10 children carried on work at the memorial.[18] Daughter Monique Ziolkowski, herself a sculptor, modified some of her father's plans to ensure that the weight of the outstretched arm was supported sufficiently.[5] The foundation commissioned reports from two engineering firms in 2009 to help guide completion of the project.[19] Work commenced on the horse after two years of careful planning and measurements.[6] Since the completion of the head and face, much of the monument's sculpting work has been dedicated to the much larger horse portion.[20][15][16]