The "nature expedition" is a tried and true exercise in elementary school science class. Assuming the identities of junior scientists, students embark into nature to collect samples of bugs, plants, twigs and sundry living things for study. The artists Pascal Glissmann and Martina Hofflin, working in conjunction with the Academy of Media Art, Cologne, have updated this model, but with a distinct twist: their samples are solar-powered Electronic Life Forms (2004-2007) or "elfs". According to the artists, "elfs are small, analog creatures reacting to light, calling the attention of the observer with their delicate sounds and movements." Isolated in glass Mason jars and accompanied by photographic documentation of the machines inhabiting their "natural" environment, the artists present elf "specimens" in the gallery much like exotic fauna. The set-up falsely attributes these simple robotic creatures with the characteristics of a living being, thus enduing the elfs with an endearing quality. Glissmann and Hofflin explain the underlying motivation for the project as a questioning of "the relationship between technology, nature and humans." The elf installation is currently on view in the "Urban Living" exhibition at Pittsburgh's Wood Street Galleries. - Gene McHugh