By request, Mike added other small articles from the desk to the layer of floating objects.  Anne returned, pulled up a chair and watched the performance without speaking.  Duke came in, carrying a step ladder, glanced at the group, then looked a second time, but said nothing and set the ladder in one corner.  At last Mike said uncertainly, "I am not sure, Jubal.  I-" He stopped and seemed to search for a word. "I am idiot in these things."