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Moreover - if only because of the ' mutual suspicion ' you refer to - the requirement to assure confidentiality most often is not at a premium and e-commerce will not effect this underlying fundamental . If the incoming beam is about the same size as the tunnel - - - and both are much larger than the wavelength - - - I think that the entrance to the tunnel acts like the standard " thin aperture " you see in all the textbooks . Yeah , um , except that the " insightful discussion " you talk about was essentially predicated on ( as became clear very quickly ) pretty idiotic and transparently ahistorical premises on the part of at least one of the participants .