Memorial

A father planted trees in the form of numbers to commemorate the year his son died in a war. You can see the 19 pretty clearly but the last two numbers have been blurred by growth of other trees. I have asked several people about it, including Mr M, and there seems to be disagreement about whether it was WWII or the Vietnam War. I see this every morning when I go to work so no matter which war it was the father achieved his goal because I think of his son each time.