A doubtful trajectory. Shadow is a two-dimensional representation of the three-dimensional, a shadow omits a dimension from the world and represents only the contours of a being without its volume. A shadow can represent the essence in varying magnitude, several times, and in varying sharpness. A poor or not clear representation of reality. Doubt is empty, it is the middle ground between the familiar and the unfamiliar, it is fundamental for evolution. Doubt can be more than a contradiction to the truth, a by-product engraved in the existence of things.
Medical ultrasound machine, ultrasonic speaker, plastic bag, and walls
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