Jay,

Get a Lucite rod from .25 to .75 inches in diameter and however long it
needs to be to pass through the wall or door.

http://en.wikipedia.org/wiki/Poly(methyl_methacrylate)

Cut one end at a 45 degree angle and polish with sandpaper. Insert into a
hole between the garage and the stairwell. Position the angle cut end so
that the flat faces the "viewing point" and it will pipe the light from the
garage into the rod where it will be quite visible from the other side.

http://www.google.com/search?q=buy+lucite+rods

Or, you can try to local a cheap "ship's prism" somewhe

http://www.bracesinfo.com/store/SHIP...461455773.html

--
Bobby G.