An upside-down Christmas tree is a Christmas tree that is hung from the ceiling or suspended from a wall, rather than being placed on the floor with the pointy end up. It's a unique and eye-catching way to decorate for the holiday season, and it's becoming more popular in recent years. Some people like the look of it, while others believe it's a bit unconventional and even sacrilegious. Whichever side you fall on, there's no denying that it's a conversation starter.