u/Neolyphic

The simple answer is obviously, "It depends".

However, for GMing purposes in the event it comes up, how often do you think it is reasonable for an average security team to be rotating bound spirits out to keep them from getting uppity? How long are you picturing that random F6 Fire spirit having been stuck guarding that hallway?

Averaged out, how long does the typical spirit take before it starts acting out and talking shit about its wagemage summoner on the spirit realm?

While an incredibly nitpickey question, I'm curious as to whether there's a canonical answer to this, given Shadowrun's relatively hard magic system.

A mage requires LOS to cast on a target. That LOS can be established even if the target is, say, wearing a full-body chemically sealed suit. Thus LOS can be established through clothes. Wearing a bedsheet over yourself like a ghost won't protect you from spells.

However if a target leans against an opaque sheet hanging from a clothesline, a mage cannot establish LOS through it.

Thus, what are the exact parameters by which magic considers you to be "looking" at someone, instead of at their clothes?

Granular and rules lawyerey I know, but it definitely feels like a question that would be examined academically in-universe. Periscopes and mage goggles exist to help mages exploit the exact definition of "looking" at a target after all.