Years before Chris Marker made his first film, he actively pursued still photography, and he spent much of his subsequent six-decade career engaged with a wide variety of media. Marker enthusiastically embraced analog-video synthesis in the 1970s and began experimenting with digitally altering images in the 1980s. In the last decades of his life, he published his work on CD-ROM, Flickr, and YouTube and built a museum in the virtual world Second Life dedicated to his oeuvre and influences. Split between the galleries at MIT and Harvard, the ambitious exhibition “Guillaume-en-Égypte”—which