I broke down rocks and called it a grain
Then that grain broke into sand
Then I took it in my hand
To break it down further was my demand
When that happened and it did
I was not able to see it
So I called it indivisible
Because to break it down further I was not able
Breaking down the invisible is @lemouth 's job
The invisible is actually visible :)
gasp WITCHCRAFT! BURN HIM!
(something I repeatedly whispered to the guy next to me in the physics lecture)
But I am not a duck! :D