There is an underground building (the entire building isn't underground)
in Minneapolis.They have a mirror system which directs Sunlight above
the ground to under the ground to light up the areas down there.If you
look in Popular Mechanics and Popular Science magazines or on the
Internet you will see an ad about a mirror thingy you can buy and
install on the roof of your house.Of course Sunlights (non mirror) have
been around for many, many years.Everybody knows about them.
cuhulin