Right now, I'm focusing on the moon. Now I know that the "Man in the Moon" face is an optical illusion, but here's another optical illusion I've noticed. Now I'm the only one I know who sees this, so here's what I'm asking: whenever you look directly at the moon (particularly a full moon) on a clear night...does it seem like there's another faint moon right beside it, almost like double-vision? That's what happens when I look at the moon.