The tunnels not only provide a much-needed shelter from the sweltering desert sun, but once inside the dazzling effect of the play of light within the tunnels can be seen. The top of each tunnel has small holes, forming on each, the constellations of Draco, Perseus, Columba, and Capricorn, respectively. The diameters of the holes differ in relation to the magnitude of the stars represented. These holes cast spots of daylight in the dark interiors of the tunnels, which appear almost like stars. Holt said of the tunnels, "It’s an inversion of the sky/ground relationship-bringing the sky down to the earth." This is a common theme in Holt's work. She sometimes created this relationship with reflecting pools and shadow patterns marked on the ground, like in her work "Star Crossed".