is the depth clue perceived by the relative shift of objects
as we move. It tells us that nearby objects shift more
and in our opposite direction, and faraway objects shift
less and seem to follow our same direction.
This familiar pattern is also how we can tell an object
remains still while we move past it.
That's the normal behavior, anyway.
INSIDE/OUT reveals the effects of
parallax turned on its head. Reversed depth is viewing
a hologram flipped over: pseudoscopically. As you move,
the face turns inside out as the eyes receive input from
the wrong "channels." The "left" information
goes to the right eye, and vice versa. In reverse parallax, the face
flips from convex to concave, rightside up to upside-down. It jumps unnaturally
and easily can swoop out of control. A wrestling match
between the eyes and the brain.