David Sohn mentions video feedback in his 1970 book "Film, the Creative Eye". This book was part of the base curriculum for Richard Lederer of St. Paul's School in Concord, New Hampshire, when he introduced making videofeedback as part of an English curriculum in his 1970s course Creative Eye in Film. Several students in this class participated regularly in the making and recording of videofeedback. Sony had released the VuMax series of recording video cameras and manually "hand-looped" video tape decks by this time which did two things: it increased the resolution of the video image, which made the picture more attractive, and it brought video tape recording technology within the general public's grasp for the first time and allowed for such video experimentation to take place by the general public.