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Optical illusion
https://www.rawpixel.com/image/14265994/optical-illusion
Free Image from public domain license
Amoy, Fukien province, China. Photograph by John Thomson, ca. 1870.
https://www.rawpixel.com/image/14017762/amoy-fukien-province-china-photograph-john-thomson-ca-1870
Free Image from public domain license