Density and buoyancy perfectly explain why objects rise or fall based on their relative density. Objects fall because they are denser than the air that surrounds them, while helium balloons rise because they are lighter - no 'gravity' necessary.
Gravity would have the same cause, and display the same effect on a ball or a plane. You are falling (or being pulled) toward a point in space. If there is a difference in how 'gravity' works in the two different models, then it is because you are describing two different things. (illusions? misconceptions?) And a description is not an explanation. Our Earth is actually a cube anyway. All the sides are more or less flat, give or take a few mountains.
Gravity would have the same cause, and display the same effect on a ball or a plane. You are falling (or being pulled) toward a point in space. If there is a difference in how 'gravity' works in the two different models, then it is because you are describing two different things. (illusions? misconceptions?) And a description is not an explanation. Our Earth is actually a cube anyway. All the sides are more or less flat, give or take a few mountains.