theme in Jerusalem  the organs of perception:

     If Perceptive Organs vary, Objects of Perception seem to 
                                  vary:
     If Perceptive Organs close, their Objects seem to close also.

     To behold, use or perceive any extension of ourselves in 
technological form is necessarily to embrace it. To listen to 
radio or to read the printed page is to accept these extensions 
of ourselves into our personal system and to undergo the 
“closure” or displacement of perception that follows 
automatically. It is this continuous embrace of our own 
technology in daily use that puts us in the Narcissus role of 
subliminal awareness and numbness in relation to these images 
of ourselves. By continuously embracing technologies, we relate 
ourselves to them as servomechanisms. That is why we must,