We all know about gravity in games. We all know about gravity in real life. Gravity keeps things on the ground and it doesn't move. However, when you start making a game you have to program the gravity in.
So naturally you can play around with the gravity. You can make the gravity go in any direction and you can even make the gravity towards certain objects.
When you play around with any game mechanic you want to push that mechanic to the max. Gravity is something we always take for granted in a game. Why not play around with it and push the idea to the max. Next time you make a game add in some cool gravity mechanics.