Directive from a painter

A painter, discussed with the customer how he wanted the various rooms of his house painted.
-In the Hall, we want to have painted in yellow colour, "said the man.
-OK, replied the painter and wrote it down in his notebook. Then he went up to the window, opened it and shouted: "green side up!"
-In the living room, we want the blue wallpaper with flowers on it, "said the man.
-OK, replied the painter and wrote down the block. Then he went back up to the window, opened it and shouted: "green side up!"
-In the bedroom as we want it painted green with the yellow band that you showed us before, "said the man.
-OK, replied the painter. Then repeated the procedure; He wrote down the pad and went back up to the window, opened it and shouted: "green side up!"
The man who now has become very confused could no longer stay but asked the painter, why hold on to shout ' green side up ' all the time?
The painter replied, "Oh, sorry! Yeah it is so that I have a few new recruits blondes who right now are putting out a finished lawn on the other side of the street. "