Micky`s Riddles award...

[Paradox]

Here's another one for you:

At the ends of the world
But not in the middle
At heights and depths
Oft big, usually little
As common as dirt,
But deadly as venom,
Floating never sinking,
I know that you've seen him.

Which Buildism user is this?

I would say me, but the "Floating never sinking" part wouldn't make sense.