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| Keywords: PSM V54 D325 Optical illusion with staircases.png en Optical illusion with staircases 1898 http //www archive org/details/popularsciencemo54newy Popular Science Monthly Volume 54 Jastrow Joseph The Mind's Eye p 299-312 author PD-old PD-US Uploaded with UploadWizard Popular Science Monthly illustrations/Volume 54 Schroeder stairs | ||||
