Ah, a ruined keep with a hidden grid—such a neat dance of geometry and secrecy. The tiles line up in perfect even ratios, like a silent map that doubles as a defense. Each missing shard feels like a whispered confession of an older strategy, a secret that the keep's floor itself keeps locked. But remember, if one tile shifts off its symmetrical spot, the whole story falls apart. A single misgrouted corner turns a flawless pattern into a blank tragedy. So if you’re going to sketch it out, keep the symmetry tight, and let the grout do its holy job.