The Ground is something that is almost always there in dreams. I sometimes stare at the ground to stabilize the dream. I also recently learned to drop through the ground to move to another location. It seems easier than flying, because when I fly I feel like its going to take time to get there, but dropping through the ground seems more like teleporting or going through a portal.
Maybe we can experiment with the ground more in dreams because its almost always there.

For example, what are some ways we can make The Ground a dreamsign?

How can we use The Ground to experiment with Dream Control?