https://www.gutenberg.org/cache/epub/29132/pg29132-images.html-THE GUN By PHILIP K. DICK Nothing moved or stirred. Everything was silent, dead. Only the gun showed signs of life ... and the trespassers had wrecked that for all time. The return journey to pick up the treasure would be a cinch ... they smiled.-

 The gun was huge. Stark and immense it pointed up at the sky, a mass of steel and glass, set in a huge slab of concrete. Even as they watched the gun moved on its swivel base, whirring underneath. A slim vane turned with the wind, a network of rods atop a high pole.