It's there and then gone, a momentary twinkling in the gloaming. As you peer into a deep crevice between the rocks, a strange golden-green luminescence seems to emanate from the darkness.Its form is difficult to make sense of: tiny grains of light like a distant city. You reach in, fingers groping for the treasure, but when you bring it out into daylight you，re left with nothing but a smear of common dirt. Were you tricked by the light?
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