Telling stories
The more modern tabletop games I play, the more I realize how stories are at the core of each and every one of them. I accept that there are abstract games all about mechanisms, strategy and making the most effective moves, but even these games have a story to them, even if it's not at the fore. After all, stories are an intrinsic part of our culture, and storytelling has been around for such a long time, that nobody knows when it began.