This was such a hard photo prompt to interpret. I'm not a sad person, and I don't go around looking for sad. I'm not trying to be Pollyanna or anything, but everything that happens has a reason and a lesson. Why be sad about that?
At any rate, because I didn't want to break my streak (can't believe I've done a photo a day every day this year! Thanks, Chantelle!), here's my attempt. It makes me sad that all the people in those pictures (we call it the grandchildren's gallery) live so far away from me.