As the landlord and the second floor can see. So far, the tallest icon on the Y plane is a hat (also known as a lantern). I see three hats. But they were all banned by Party Y, because that was the level of painting. Since YY was born, according to YY integral algorithm. Even if you keep hanging, you can't hang three hats. Because YY has not reached the number of days of three hats since birth.