CLOWN – Find his dog.
This vintage optical illusion card is an advertisement for Holloway’s Pills & Ointments, a popular patent medicine in 19th Century England.
The real trick was to find helpful ingredients in the "medicine" that this card advertised, since the pills and ointments contained very little real medicine. However, since Mr. Thomas Holloway advertised so extensively, they likely had a placebo effect for some.
But ignore all that. It’s a clown. Find his dog.
Museo Ilusionario, Flickr>>