Building a Box

Boxes always make me think of four

So when I made a flower box
Those are all the sides I used
A back a front
Both long
A side another side
Both short

All fourness nailed together at the corners
It looked  a proper box

I filled it with soil
Ready for seeds

This would have all been fine
Except the box was in the wrong place

And when I moved the box
The earth stuck to the ground
Instead of the box
Because earth prefers sticking to the ground more than anything
Which is why that is where you usually find it

And this may be
Why gravity is

And boxes are not four