“We?re such a visual culture,” said Patricia Boyette, head of the acting and directing program at UW-Madison, and director of a performance of H.G. Wells? “The Time Machine” to be broadcast live at 8:30 p.m. Saturday on Wisconsin Public Radio (WPR). With radio drama, “it?s all about the voice,” she said. “It does appeal to the imagination; it?s not all spelled out for you.”