One of the wonderful features of the Sun Tunnels is the series of holes drilled in each of the concrete tubes.
Without knowing what they were, you would be tempted to think they were just holes that make for terrific viewing of the desert and mountains beyond, but in fact, they have a very specific purpose.
The holes come in four sizes, either 7, 8, 9, or 10 inches in diameter), and according to Holt, "each tunnel has a different configuration of holes corresponding to stars in four different constellations--Draco, Perseus, Columba, and Capricorn.
"The sizes of the holes vary relative to the magnitude of the stars to which they correspond."
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