"Moonlight" (2002) by Icelandic artist Olafur Eliasson is an immersive installation that uses monofrequency sodium vapor lamps to create an otherworldly, monochromatic yellow environment that transforms the viewer's perception of color and space. The work exemplifies Eliasson's practice of employing light and natural phenomena to generate experiential environments that challenge how we see and understand our surroundings. By rendering the gallery space in a single wavelength of light, the work collapses conventional color perception and creates a meditative, almost alien landscape that engages viewers' sensory expectations.