Whenever the PRC national flag is flown together with the regional Hong Kong flag, the national flag must be flown at the centre, above the regional flag, or otherwise in a more prominent position than that of the regional flag. The regional flag must be smaller in size than the national flag, and it must be displayed to the left of the national flag. When the flags are displayed inside a building, the left and right sides of a person looking at the flags, and with his or her back toward the wall, are used as reference points for the left and right sides of a flag. When the flags are displayed outside a building, the left and right sides of a person standing in front of the building and looking towards the front entrance are used as reference points for the left and right sides of a flag. The national flag should be raised before the regional flag is raised, and it should be lowered after the regional flag is lowered.