When it comes to sculpture, there are those that add and those that take away. Stone cutters are the latter, and perhaps in this case I should say "taketh" away.
It appears the fellows are carving a tombstone or memorial of some type, and I am going to guess for a notable. It also appears the piece was carved under a temporary tent built for the purpose? A mystery.
Enlarge the pictures to see their big whacking hammer on the ground and the equally cryptic message on the inscribed, but unmailed card.
Real Photo Postcards circa 1900? No date. Collection Jim Linderman