Book T3 - Translucency
A thing can be translucent. A thing is usually not translucent.
Examining it through is an action applying to one visible thing and one [touchable] thing.
Understand "examine [something] through/in [something]" or "look at [something] through/in [something]" or "x [something] through/in [something]" as examining it through.
Check an actor examining something through something (this is the can't look through an opaque lens rule):
if the second noun is a container:
if the noun is enclosed by the second noun:
if the second noun is open or the second noun is transparent:
make no decision; [This should be allowed through.]
if the second noun is not translucent:
if the actor is the player, say "[The second noun] [do]n't make a very good lens." (A);
rule fails.
Carry out examining something through something:
say "Through [the second noun] you can make out [the noun]. [r]";
try examining the noun.
Report someone examining something through something:
say "[The actor] [peer] into [the second noun], examining [the noun] closely."