Noren ni Udeoshi " to push against the entry curtain"

When the noren(curtain with the store name printed on it)is hanging in the doorway of a noodles shop, Japanese restaurant, tea house, or other classically Japanese establishment, the place is "open for business." Since the noren is a hanging cloth, nothing is achieved by pushing one's arm against it. Such is the feeling one experiences when taking an action (through words or deeds) which elicits no response whatsoever.