On a globe earth
A person on the north pole and a person on the south pole
Are relative to each other upside down

Not only people
But planes would be flying upside down

In the northern hemisphere
It would rain upside down in the southern hemisphere

Maybe we do not live on a tilting wobbling space ball

The only place everything could be right side up
Is on a level stationary plane
Where the sky is always above your head

If a person digs halfway down into the earth
He would then start digging upward
And would eventually pop out feet first on the other side

All the people there to meet him
Would be standing upside down

On a globe earth
Up is down to some
While down is up to others
And the stars would be both below and above us

For the people at the equator
Up and down would be perpendicular and sideways

On a flat earth plane
Down is in the direction of density
And up is in the direction of lightness

The ground will always be down
And the luminaries will always be up
Circling over and around us

A planetarium projects the rotation of celestial lights
Onto a stationary dome

If it added a beam of light in the center
It would better illustrate our world

Which is a plasma torus
With a drift current flowing through the middle!