How did sisqueros, Echo of a scream 1937 express the trauma of human loss?

Echo of a Scream is Siqueiro's iconic painting conceived in 1937 before he started working against Francisco Franco's fascist dictatorship. The event which represents the painting is aftermath of a war and the trauma of human loss. ... Siqueros used intense colors to represent a very dark and catastrophic period of time.

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photography had emerged as an elite art pursued by a few creative individuals for a few wealthy patrons. but now, said bauldelaire, it was succumbing to "the great industrial madness of our times." it was becoming a mass production industry that catered to middle-class tastes, including a taste for gadgetry. the stereoscope, the first 3d imaging system, had turned looking at photographs into parlor entertainment. a "thousand hungry eyes were bending over the peepholes of the stereoscope as though they were the attic-windows of the infinite.