Appeared in Nature. Online.
Leo Wilson watches ants walk through solid-looking glass. They die when he's not watching. He tries it himself and succeeds.
Play on words necessary for understanding ending or you'll be befuddled: Solidity/Solidarity -- that is, state of matter and the state of politics are related.
Government officials call Leo to advise on how to get their officials out of walls. Leo shrugs. Ants do it better (work together, walk through walls).
A common Zebrowski motif is that wish or desire can become literally manifest, as seen in "Once We Were Dragons" or "The Word Sweep". One might say it's implied in others.