Depth is something that only exsists in space.
It does not exsist in flat surface. It is a degree of vertical descent in space.
However, is depth a relative one or a absolute one?
Let’s take it to a mathmetical model.
In geometry, the space is defined using a ‘ space coordinate system’.
There is a origin (simply used as ‘o’) which is a starting point of a coordinate.
And the space under the origin has a depth.
But if we randomly define this origin, the space which had depth may not have depth anymore.
Can we actually define something “Definite” ?