Erwin Hapke's secret museum09/23/2016September 23, 2016He lived as a recluse for decades, and in the privacy of his home the German biologist Erwin Hapke folded hundreds of thousands of models from paper and metal: the fascinating legacy of a recluse.Copy linkImage: WDRAdvertisementHow international is the Oktoberfest?04:12This browser does not support the video element.