Differences in light transmission and reflectance in space result in some significant differences in available perceptual cues in the extravehicular environment as compared to earth atmosphere. Atmospheric light scatter does not exist in space due to the lack of particulate and gaseous material. Thus, aerial perspective cues are absent. Figure-ground contrast is increased Shadows appear darker and more clearly defined Luminance Range (Contrast) Problems arise on EVA missions when crewmembers go from working in sunlight to working in shadows.