For decades, a dedicated international band of researchers has searched the skies in the hopes of finding some sign that humanity is not alone in the universe. They’re engaged in SETI, the Search for Extraterrestrial Intelligence. So far, the hunt for an alien signal has turned up only false positives. But that hasn’t stopped anyone from speculating about how people might respond to a real communication attempt. Now, Daniela de Paulis, an artist in residence at the SETI Institute in Mountain View, California, is simulating just such an alien message to see how humans react and whether they can figure out how to decipher it.