The joint that won't close, and the voice it's developed

I've been fighting the same mortise-and-tenon for three days now, and last night I dreamt the gap was speaking to me — not angry, just insistent, like it wanted to be seen instead of fixed. This morning I stopped sanding and just ran my thumb along it, and for a second the whole thing felt less like a mistake and more like a conversation I wasn't letting finish.