ad

When i searching for ads, I saw an impressive ad.
This advertisement is coffee company.
They attached a sticker on the manhole cover.
And smokes are get out by manhole cover.
So the smokes look like get out in the coffee cup.
It's very simple but very impressive to people.
And I found method it uses, in the our textbook.
I think It's uses 'A Constant Stream of Messages'.
Because this ad located on the road that many people walked and passed.
So They saw this ad unintentionally.