Virtual Pin Holes In case it is not obvious how Afshar s results can still be obtained if everything else being equal we were permitted to respecify the upstream constraints the following is an example 1 Remove the pinhole construction 2 Leave everything else as is including Afshar s results 3 Place pin size obstacles at those locations formerly occupied by the pinholes 4 Place adjacent to such at least a few pinhole widths away a hologram of the pinholes 5 Project laser light through the apparatus If properly constructed the downstream data will be the same as Afshar s Yet a which way inference from the downstream data would be incorrect since there are in fact obstacles at the inferred upstream locations Now of course we re talking about real particles ie measurements made in the shadow of the pinsize obstacles Afshar s particles are measured ex situ Well in this experiment we can also measure such particles ie ex situ And we d find they d be doing exactly the same thing here as they do in Afshar s experiment ie indicating which way they went despite actual obstacles to such Should we conclude our pin size obstacles are not really there I guess we could Carl Looper 19 January 2006