“…The quantum laboratories of Eigler et at. [3] made certain phenomena literally visible, notable those which concern the most abstract foun dations of quantum mechanics [4], The fact that we have recently succeeded [5] in build ing artificial structures at temperatures appre ciably above the temperature (4 K) at which the previous experiments were performed gives rise to the hope that, with the STM, man-made patterns can be built routinely in the future from atoms and molecules.…”