Acoustic barrier

• 2026-08-28 [Conjecture] The level trend of the self-similar acoustic barrier is fineness, not self-similarity: a random tile at matched solid fraction and cell size, three seeds, r = 4, also falls with level and blocks more at every L2 and L3 - random against self-similar at L2 / L3: carpet 0.264 / 0.074 against 0.390 / 0.128, net 0.229 / 0.099 against 0.467 / 0.215, tree 0.221 / 0.066 against 0.781 / 0.666, void 0.211 / 0.104 against 0.270 / 0.235 - with a seed spread of 0.006 to 0.037.