On the "Ball Experiment" -
So the argument is admitting that the ball experiment
is a perspective effect, but the argument is now pointing out that when you align the ball to the Moon, the phase points in a similar direction. This is an argument that the Moon is undergoing a perspective effect.
If the Moon was aligning itself along on a surface of a sphere, it would also match the perspective effect. The perspective effect is unable to distinguish whether something is curving/aligning on a sphere around you, or if it is pointing upwards to perspective, because when you look around an object with this perspective effect the shifts in the perspective are making spherical shifts.
I created a semi-transparent wire-frame sphere with a purple cone inside of it:
Front View - Take note of the two rings that looks like an
X:
Top View - Again, take note of the two rings that looks like an
X:
Now when I aligned two of the rings which were angled like X's from the front and top views above the cone pointed upwards, matching the angle of the ring in the foreground and background.
View is from below the work plane. The purple cone basically matched the sphere around it.
There is no way to distinguish whether something is angled on the celestial sphere or not with this effect alone. Since this effect is orienting bodies in a spherical manner it will not distinguish whether something is truly angled as if on a sphere or not. Perspective causes similar shifts in a spherical manner simply because when you perform this effect you are looking at the object from a spherical direction around it. When viewing from spherical directions around an object it follows that it will shift in a spherical manner.