The sane were unsettling. Mathematical neuropsychology might have proved their artificially adjusted neural pathways optimal by some unassailable theorem, but to normal eyes they were strange in undefinable ways. How do you describe the glaring wrongness of somebody who's not broken in any way, a perfect sphere in a world of boulders? We hadn't known our own minds, lacking an undistorted reference to judge them against, and having found it, we could neither ignore nor tolerate the ugliness we saw.