Inspired by the mischievous constructor robots, Trurl and Klapaucius, in Stanislaw Lem's science fiction story, "The Second Sally", I collaborated with Will Langford
to engrave the words "JUST SAND" on a single grain of sand using an Excimer micromachining laser.
"[...] even the sawdust, everything which the constructors returned exactly as promised, was thoroughly examined under an electron microscope. But except for a miniscule card in the sawdust which read JUST SAWDUST, there was nothing out of the ordinary." - Stanislaw Lem, The Cyberiad