Figure 2.

Schematic of apparatus. The active matrix screen of the computer was mounted horizontally in a frame 38.3 cm beneath a black screen containing two apertures, 6.4 cm apart. Each aperture contained a 38.3-cm focal-length lens. A partially silvered front-surface 40 × 40 cm mirror was mounted at a controllable angle above the lenses, so that subjects looking through the mirror viewed virtual images of 0.62° diameter “moons.” Two moons were located under each lens to produce four virtual images at optical infinity. Subjects looking through the mirror fused the two sets of moons and saw one pair of moons in the sky.