Oh yaar, when my ustad explained it, he said it's the physics of the air's "node" being stuck at the closed end—so only odd harmonics like the first, third, fifth can sing. But, you know, listening to my shehnai, which is a closed pipe, I feel those missing even harmonics aren't really skipped; they hide in the timbre, giving our instruments that rich, crying sound. It’s not a lack, it’s a different kind of fullness—like how my shop isn't missing digital printers, it’s holding a different warmth in its ink.
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