"Atmosphere" consists of a voluminous circular structure that fills most of the museum gallery. Its heavy steel exterior and commanding height contrast with the rich light that spills from the central core. A sloping ramp invites visitors to enter and explore the interior where a vertical column of glass tubes projects light, casting silhouettes of visitors onto the environment’s rounded walls. As participants make their way through the space, their movements produce optical phenomena noticeable in their peculiar shadows: when visitors stand upright, their shadows follow their vertical postures but also spread out into clean stripes in a tonal range from dark to light. Horizontal movements cause shadows to disappear. Light levels slowly fluctuate as electrically charged argon and neon mimic the colors of the Arizona sky. Fraser poetically described this multisensory experience: “We no longer just breathe these gases. Now that they are visible—we see them, we wade through them."