I see you have recognised you have no way out for the tube, so you have given up.
Again, ultimately it come down to 2 options.
Either pressurised air can magically be contained inside an open tube, or rockets can work in a vacuum.
Which one are you going to pick?
The only way I can explain down is by picturing each layer of balls having one less layer in each ball in each stacked layer all the way up.
Which is just describing down, not explaining it.
Why should each layer of balls have one less layer inside each ball than the layer below?
Now you throw a bowling ball in which has a bigger size but also a lot more layers. Let's assume it has 500 layers and that ball is within the middle of the other balls and has now displaced all those balls by its dense mass of size and layering.
Those smaller balls are compressed all around a little bit more than they were and are now vibrating more because they are under more compression and are trying to decompress but in doing so manage to crush back on the bowling ball but can't and with it being denser, the crush can only be against more resistance around and below it, not less above.
So the crush is going up? With the more dense balls crushing more than the less dense balls?
Let's use your rock.
Imagine a box, empty to look in but you know it's full of atmospheric pressure.
Ok, you now place the rock inside of that box. Now imagine you do this without losing the initial pressure already inside.
The rock displaces the atmosphere and creates more pressure inside the box. It creates an extra force within from its own dense mass minus its internal volume.
It compresses the gas. The force is initially coming from whatever force compressed the gas.
It is NOT coming from the density of the rock.
We can also see that regardless of the density of the rock, the volume of the rock is what determines that extra force.
Put your mind to work.
We have. You should try it some time.
It doesn't matter if you set it remotely or whatever, the scale will still have offered negative pressure upon it. Only you have zeroed it from what you would clearly see as negative.
Again, it actually gets a positive reading, from the lack of a buoyant force pushing the scale plate up.
Regardless, even if it did magically get a negative reading, why wouldn't that be a constant, such that when zeroed, it is taken care of and any additional force would be the same?
It's a crush back all around to any dense mass.
Notice:
"ALL AROUND"
So the question is where is this crush strongest?
The region below with high pressure gas pushing up?
Or the region above with low pressure pushing down?
Thinking about it leads to higher pressure -> higher crush -> object pushed up.
Lowering of of resistance.
What resistance?
Remember, in your fantasy, this resistance is what is pushing things down. So if that lowers it should weigh less.
Gravity is a con job to make people think it offers extra to a pressured atmosphere.
Gravity is currently the best explanation we have.
There is nothing to indicate it is a con.
You have nothing to show any fault with it.
You are entirely incapable of providing a viable alternative.
Stacked molecular layering.
Again, the stack, with greater pressure below, means they should go up, not down.
It comes down to the dense mass of any object against the resistance under it.
This only makes sense with a downwards force proportional to mass and an upwards force not proportional to mass.
Such a situation explains why heavy things fall, while low density things float.
If it is all air, there is no reason for this at all.
So the question remains, why can't a dense object be placed against the lower surface of a more dense table, and have it sit there against that dense foundation?
Why does it instead fall away?
More dense mass displacement of atmosphere creating a crush back against less resistance to it.
Again, in normal atmosphere (without the table) less resistance is up. So objects should be "crushed" up.
Not down.
There can never be forces of attraction, only forces of compression and decompression.
Why?
Drawn in your mind means pulled and that cannot happen in reality.
Yet it is what is observed. So your claims don't match reality.
I recognise the story of the fiction.
You dismiss it as fiction.
I'll tell you what does make sense and Einstein's name has been used to skew reality in my opinion because warped space is entirely what denpressure actually is
So you are now claiming denpressure is curvature of space time, not the air magically pushing?
How do you think the bowling ball was placed into that area when you know its dense mass is massively greater?
How about dropped in from the top, through a tube which is just wide enough for the bowling ball so it creates a nice seal around it.
Then we can even play with the length of the tube and see how with a large enough pressure difference it will hold the ball up against gravity.