Question - Flags on the greens of the golf course and a few colors, but the colors do anything.
The answer - all three colors of the flag are red, white and yellow color, but it acts like it is, telling the players to know where the holes of the green. Red is in front of the green. White is in the middle of the green. The yellow behind the green. It enables players to know how long the strike should have been more precise. Or can you force should not be hit.