https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13972920Edit ImageSaveSaveEditCropCustom TextArchitecture: the geometry of a curved staircase. Engraving by A. Bell.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 909 x 1200 px | 300 dpiLarge JPEG 2310 x 3049 px | 300 dpiFree DownloadArchitecture: the geometry of a curved staircase. Engraving by A. Bell.More