"The curious inversion of Plattner's right and left sides is proof that he has moved out of our space into what is called the Fourth Dimension, and that he has returned again to our world."
Plattner disappeared when he experimented in a chemistry class with green powder found by a boy, which caused an explosion; he re-appeared nine days later.
People, dispersing from a mausoleum-like building in a gorge, have heads showing distress and anguish, above tadpole-like bodies.
"It may be... that, when our life has closed, when evil or good is no longer a choice for us, we may still have to witness the working out of the train of consequences we have laid."
Not daring to see the shadow behind the arm, Plattner runs and falls, smashing the bottle of green powder, which explodes; and so he returns to his former world.