Engineer Quest: Enigma B

Engineers are a very inquisitive bunch. They love riddles too, like this "Enigma B" quest. 

Look right through me

The riddle this lady engineer offers you starts like this:

"Everywhere I go, people seem to look through me. Hmm..."

Immediately you think of glass. Windows, spectacles, glass? Empty beer jugs?

Transparent

Accessing the quest in your Questbook offers you another clue (in case you need it).

"What commodity is so transparent you can see right through it?"

Still, the empty beer jugs at the pub meet the requirements. But seeing as we don't own any buildings that produce beer jugs, it must be something more boring.

These days, I seem to be looking through windows quite a lot, being in lock down and working from home and what not. So it's either the glassmakers or the window makers. Could be either.

And there we have it. Yes ma'am, it's the window makers!

Just click on a window makers building (ANY window makers, even the ones of your competitors are allowed!) to finish this quest and retrieve your easily earned reward.