Leonard Nimoy gives us a talk though with the help of a, (thought mind crystal) on this rather logical device hmmm, fascinating. :D

PART 1: Leonard Nimoy Demos The Magnavision VideoDisc Player
http://www.youtube.com/watch?v=tWuapIF2Cdw

PART 2: Leonard Nimoy Demos The Magnavision VideoDisc Player
http://www.youtube.com/watch?v=HrM_2smni7M&feature=related