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Female ophthalmologist with trial frame and little girl in clinic
Penrose stairs, Penrose steps, or also impossible staircase, an impossible object and optical illusion. Two dimensional depiction of a staircase, forming a continuous loop. Isolated illustration.
Fiber optic cable icon design illustration. Electric wire sign, digital internet, Gold color round button design
Fiber-optic cables coming out of the ground on a sidewalk. Picture taken during the process of laying fiber-optic cables in Germany.
Abstract spiral shape. Geometric vector illustration. Optical illusion element. Circular design symbol.

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