Since the early 1970s, Roman Signer has been making art that refuses to be described in conventional terms. His objects and installations look like science experiments, and his photographs and films seem only to document their results: In compliance with carefully planned and strictly executed and documented procedures, Signer sets off explosions and collisions, sending his materials flying through space. Videos like "Boot with Rocket" capture the original setup, soon to self-destruct. Signer's work gives cause and effect a humorous twist, as it does the scientific method, taking on the self-evidence of scientific logic as an artistic challenge. But in the midst of all this, Signer has also been making a much quieter and more conventional body of work, not unlike the one most readers keep in a shoebox on a shelf in their closets: His "Reisefotos," or travel photographs, track the great experiments of 20 years on and off the road, found works that, like Signer's own, called out to be documented. Whether his subject is a host's arrangement of objects or an event he's reluctantly participating in, it takes on an illustrative or narrative element, and sometimes a touch of irony. "Travel Photos" presents a previously unknown but completely characteristic side of Signer's work.