window blinds?

[TightSlot]

You can find previous discussion about this HERE although the thread goes walkabout after a few posts (as has almost happened on this one)

The good folk posting here before me are pretty much spot on.

• Both pax and crew can see any problems developing immediately, both prior to and during an evac
• Post evac, others can see in
• In daylight, after an electrical failure, cabin emergency lighting may be enhanced by light coming through the windows
• In a smoke filled cabin, the glow from a window row may help orientate the visually confused

I wouldn't be surprised if somebody could come up with other reasons that I'm not yet familiar with, but these are the ones that apply chez nous