The highlight on the monster’s claws in
Figure 1b suggests that the claws
are very hard, and that they can
hurt someone easily. In Figure 1c
the highlight on the rear window of
a car shows that the window is
somewhat rounded, since the high-light area is not a simple rectangle,
but a little bit deformed. This high-light could be a kind of environment reflection or refrac-tion, rather than the brightest area on the rear window.
In addition the highlight just shows the area where
something is reflected; we don’t see what is actually
reflected on the window.