1. An autostereoscopic image display apparatus for modifying the spatial position of a left eye viewing pupil and a right eye viewing pupil in response to feedback data about an observer, said display apparatus comprising: (a) an adaptive autostereoscopic image delivery system comprising: (1) an image generator for generating, from an image source, a left eye image and a right eye image; (2) a control logic processor for accepting feedback data about said observer and of providing a command in response to said feedback data; (3) a left viewing pupil forming apparatus for providing said left eye image, as a virtual image, to said left viewing pupil for viewing by said observer; (4) a right viewing pupil forming apparatus for providing said right eye image, as a virtual image, to said right viewing pupil for viewing by said observer; wherein said left viewing pupil forming apparatus and said right viewing pupil forming apparatus adjust the position of the left viewing pupil and right viewing pupil respectively, based on said command from said control logic processor; (b) at least one observer feedback sensor for providing said feedback data to said control logic processor.