http://en.wikipedia.org/wiki/Backmasking#Subliminal_persuasion

"You can write upon both sides of the tape" as MARK R was to tell me in 1994...he was talking about video as well as audiotape...in relation to programming the human brain as if it were simply a 'library of blank tapes'...for example SCARLETT wrote on one side of the tape - and he wrote on the back of it...so which 'tape' won out?

If you think about the literal reality of an audiotape...there are many subliminal frequencies...what can be consciously heard...and what can be heard subconsciously, at a deeper level of consciousness...

...and I am assuming here that the ill looked into VIDEO as well...with an eye for 'doing the same in some way'...