I was thinking about an experiment I saw in my high school physics class 20 years ago. I believe the experiment is a common one, used to explain gravity.
4 students hold a sheet, 1 at each corner. A weight is placed in the center of the sheet. Then a marble is added. The marble will roll toward the weight, and will sometimes briefly orbit it.
This is used to show that gravity may be caused by a warping of space.
What occurred to me is that another way to look at it is that the weight AND the marble are being pulled by a forces that is perpendicular to the 2d space of the sheet. The gravity of the earth is pulling on both of them, from the third dimension (beneath the sheet). As a 2d creature on the sheet, it appears that the marble is attracted to the weight by an unseen force.
So, perhaps gravity is a force that is emanating from a single "direction" from a 4'th spatial dimension?