[ExI] Indoor or Underground Lighting

[spike]

Lee wrote:  ...Suppose that I'm in a small cavern underground and that
I'm walking on a treadmill, so that I am not moving
relative to the walls of the cavern.  Does humanity at the present time have
the ability to make
me think---at least when I'm looking down at my own
shadow---or to make it appear to me that I'm in natural
lighting...Lee




He's starting to catch on, Christof!  What will we do with him?

Marlon