Edgar Lissel has been using the camera obscura for more than 10 years. He converted a transporter into a mobile pinhole camera and transformed living quarters and museum displays into walk-in pinhole cameras. Since 1999, Lissel has been working with bacteria, using their phototropic properties to produce his images. The bacteria move out of the shadow into the light. In the photographic installations Mnemosyne I and Mnemosyne II, he uses fluorescent color pigments to fix the images. Like a memory, the image is stored and emitted by the pigments.