Dennis was genius in his approach to using 'Preventing from Knowing', he provided us with a theory, with a model and the simplest set of processes one could imagine - with the true gift of showing that it could be done by oneself, therefore no-one else's model of the world mattered anymore. It showed us that we can spot an imposition from another 'a mile away'!
Take those impositions - and place them back where they belong! lol
And to top this off, DHS never gave away the personal aspects of his own story or what could be found, thus removing any potential dub-in from would be travellers coming afterwards - a true genius, who really knew his stuff and actually walked the talk!