I have been stuck inside my house for a month, with a month to go thanks to some broken bones. The house sits across from a park with big trees, lots of birds and people playing sports. I can feel my change in mood and contentment when I look out the window or sit on the porch (weather and mobility permitting). There's also a general ambient pleasantness knowing I'm within the greenery even though I'm inside. It's been keeping me sane!

I'm lucky enough that most of our city is like that, incredibly green. But I have worked in some pretty grim buildings, and would never take an office without windows anymore.