19 Jan
2007
19 Jan
'07
5:49 p.m.
Yup, it's really, really simple. But my brain still came up with some cool surfaces before I figured that out :) Mostly I think it's because there are an infinite number of lines through the midpoint, and until I saw the solution I kept thinking it would get weird, say, very near the +x axis for large x values. -J