After exiting the display of antique computers, the group wound its way through a variety of exhibits: autonomously guided vehicles currently being used in the Mars exploration program; war simulators used to train monotank drivers; simsense walk-throughs of CAD/CAM do-it-yourself architectural programs; animated-cartoon holograms that described the development of ASIST (emphasizing the minor role Mitsuhama had played in its development); and a gigantic, two-story-tall mockup of an optical data-storage and retrieval system. The kids loved that one; they got to slide through strobing tubes, pretending they were individual photons of light. By either bunching together or going singly, they could duplicate the pulses by which data was encoded and could trigger different sounds and holo images. Each group of children erased the data of the group who’d preceded them, writing their own combination.