The living come with grassy tread
To read the gravestones on the hill;
The graveyard draws the living still,
But never anymore the dead.
The verses in it say and say:
"The ones who living come today
To read the stones and go away
Tomorrow dead will come to stay."
So sure of death the marbles rhyme,
Yet can't help marking all the time.
Robert Frost 1874-1963

Also see another image here.

The camera which I temporarily modified...