Looking through, with holes

A view through one of the four Sun Tunnels, looking straight out at another of them, with some of the holes--and their shadows--visible inside the 22-ton concrete tube.

Holt writes, "During the day, the sun shines through the holes, casting a changing pattern of pointed eclipses and circles of light on the bottom half of each tunnel. On nights when the moon is more than a quarter full, moonlight shines through the holes casting its own paler pattern. The shapes and positions of the cast light differ from hour to hour, day to day, and season to season, relative to the positions of the sun and moon in the sky."

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