: I can't make that star look concave no matter how I look at it.
: Scott

Turn the picture the other way up so the light is falling from
the opposite side (you can just stand on your head and look at
your screen - but it really is easier to save the pic, roate it
180 and look at it that way). Actually, the light is coming from
sufficiently overhead that even that is not perfect, but you _can_
get it to look concave. Possibly it looks more convincing just
rotated 90 anticlockwise - try looking at the clamps first and
then letting your eye take in the star.

Andy