The invention of field ion microscopy by Erwin W. Muller, 44 years ago
, was followed by a few years during which it came to fruition in his
Penn State laboratory, as the first atomic resolution microscopy. Reco
llections of those times, the people, the events - including a new loo
k at the crucial day - and the thinking in Muller's laboratory are pre
sented. along with some retrospective analysis considering the roles o
f evolution. chance and field evaporation.