One is from the Eternal Gardens and the other is from the lower depths. The future city is lit like an ocean liner and then the lights go out. " ...
the inter-titles tell us that the mob rushes toward the Moloch Machine, the powerhouse of
Metropolis, leading to flooding, crashing, and great flashes of light ... " In the flooding, water seeps upwards and children are rescued in the panic. Moral: the mediator between the head and the hands/the heart must go on.
