 If the argument developed in EPR has its roots in the 1930 Solvay conference, Einstein’s own approach to issues at the heart of EPR has a history that goes back to the 1927 Solvay conference. (Bacciagaluppi and Valentini 2009, pp. 198–202, would even trace it back to 1909 and the localization of light quanta.) At that 1927 conference Einstein made a short presentation during the general discussion session where he focused on problems of interpretation associated with the collapse of the wave function. He imagines a situation where electrons pass through a small hole and are dispersed uniformly in the direction of a screen of photographic film shaped into a large hemisphere that surrounds the hole. On the supposition that quantum theory offers a complete account of individual processes then, in the case of localization, why does the whole wave front collapse to just one single flash point? It is as though at the moment of collapse an instantaneous signal were sent out from the point of collapse to all other possible collapse positions telling them not to flash. Thus Einstein maintains (Bacciagaluppi and Valentini 2009, p. 488),