Nemi cleaned the lower panes of the coastal academy. From below, she could see how much glass the tower had gathered. Each court its champions had conquered had given it another piece. From above, the founder could see the sea, the courts and the trophies. The academy liked the view from that height. It spoke of its system as if weather, opponents and time had all been accounted for.
One evening Nemi found salt flowering around a fitting where the glass met its support. She scraped the pale crust away. It returned. The surface could be polished, but the mark had come from the joint beneath it. She took her observation to the council before the final.
The council chose to make the glass shine. Visitors would see a clean tower; players would see the new banner raised above the court: UNBREAKABLE. Nemi went back to the lower panes. She could not know when the fitting would fail, or whether it would be the first. She knew only that the salt had come back after someone had made it disappear.
The storm reached the academy during play. Lightning struck the racket-shaped spire. For a moment the tower seemed to hold its height. Then the glass opened along the weaknesses beneath its bright surface, sheet after sheet falling as players fled the court. Trophies and rankings came down with the walls that had displayed them. When the noise stopped, the sea was still there. So were the people who had escaped.
At dawn, the founder wanted the tower rebuilt exactly as before. Others, looking at the wreckage, wanted no walls ever again. Each answer spared its speaker a different kind of attention. Nemi offered the founder the corroded fitting. The lightning had made the failure impossible to ignore; it had not made the joint weak in a single night.
She asked the survivors to sort what remained. Which pieces had protected people from weather and harm? Which had mainly protected the academy's name? Some glass could still be used. Some claims about that glass could not. They rebuilt a lower practice court with clear joints that anyone could inspect. It was less impressive from the sea. Inside it, a player could see where a wall met its support.
They left the broken tower beside the court. It served as a windbreak, which was useful. It was also difficult to look at without remembering the banner. Neither use erased the other. Practice resumed, and the story of the night passed from person to person. Some told it as proof that no structure should be trusted. Others made the lightning the whole cause. Nemi had lived through both the ignored warning and the fall, and neither telling was enough for her.
Years later, another storm approached. The new glass flexed and held. Nemi cleared the court anyway. A student asked whether she trusted their work. She said she did, then checked the last gate and waited until everyone was outside. Trust had made inspection possible. It had never required a player to stay beneath glass simply to prove the builders right.