Hermann von Helmholtz's pin-cushioned chessboard figure demonstrates that straight lines in the world are not always perceived as straight and, conversely, that curved lines in the world can sometimes be seen as straight.Rogers, B., & Brecher, K. (2007). Straight Lines, 'Uncurved Lines', and Helmholtz's 'Great Circles on the Celestial Sphere'. Perception, 36(9), 1275-1289. Furthermore, the retina has variable sensitivity across its wider-than-180° horizontal field of view, as well as differences in resolution between peripheral and foveal vision.Cooper, E., Piazza, E., and Banks, M. (2012). The perceptual basis of common photographic practice. Journal of Vision, 12(5), 8.
Hermann von Helmholtz's pin-cushioned chessboard figure demonstrates that straight lines in the world are not always perceived as straight and, conversely, that curved lines in the world can sometimes be seen as straight.Rogers, B., & Brecher, K. (2007). Straight Lines, 'Uncurved Lines', and Helmholtz's 'Great Circles on the Celestial Sphere'. Perception, 36(9), 1275-1289. Furthermore, the retina has variable sensitivity across its wider-than-180° horizontal field of view, as well as differences in resolution between peripheral and foveal vision.Cooper E., Piazza, E., and Banks, M. (2012). The perceptual basis of common photographic practice. Journal of Vision, 12(5), 8.