Painting “All is Vanity” by Charles Allen Gillbert (1873–1929). Place mouse over image and observe the change.
Comment. This is not an “optical illusion” proper, it’s more a physical effect: With the strong spatial low-pass filtering, the blurred version simply lacks the fine details. However, one could also argue that the low-spatial frequency information is masked by high spatial frequencies like in the“Lincoln effect” by Harmon & Julesz (1973) “The recognition of faces”. Related paintings are depicted below; feedback educating me on the unknown sources is welcome.
I owe the original slide to Prof. Mackensen.
Interesting background on skulls in culture & art
|Def Leppard album ‘RetroActive’||Wotherspoon ‘Gossip, and Satan came also’||Wotherspoon ‘Society, a portrait’||Dali ‘Voluptate Mors’ (Photo: Halsman) [Orwell on Dali]||Dali ‘Ballerina’||Cher, album ‘Heart of stone’|
|‘L'Amour de Pierrot’ ≈1905||Au revoir!||‘La famille Impériale de Russie’ (French post card ≈1908)||Cat or Couple? (unknown)||French postcard
(on Planet Perplex)
|Judge Magazine cover, 1894 “Death to our industries!”|