Ringer's c. 1920s Optical Illusion Cigarette Cards, Complete Set of 25 psychology Snake charmers

Snake charmers

just adding a little to its nice sense of object hood

The backs read: "Importe D'Autriche" (imported from Austria) "VB Lyon" and "Dessin-Depose en France" (designed in France)

which I'd guess were likely the dates of birth of the three children of the woman who owned this

Ringer's c. 1920s Optical Illusion Cigarette Cards, Complete Set of 25 psychology Snake charmersSince finding a set of these c. 1920s British "Optical Illusion" cigarette cards several months ago, I've been actively looking for more I think the colors and graphics are fantastic, and what's more fun than optical illusions? On the back of each card is an explanation of each, or in some cases instructions for how to create an illusion according to the diagram on the face of the card, which admittedly in a few cases seems a fairly cumbersome