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Ambrotype

Size
Date
Country
Artist
Case
Colour

Square
1861-1862
New York, USA
Unknown
No case
No colour

This optical illusion was copyrighted in 1859 and published in
Moore's Rural New Yorker in 1861, December 14th. This is an ambrotype
copy of the original newspaper, held by a metal wrapper. Possibly someone
admired the illusion so much, they made the copy themselves to show to friends.

The text underneath the illusion reads as follows:

Supposed portrait of a celebrated "professor"
As intimated some weeks ago, we give a portrait of the self-styled "Professor" of "Terra-Culture"
the man who don't admire certain "Learned Agricultural Editors", because their exposures have retarded
his progress and profits in "disclosing the disclosures." The above is supposed to be a portrait of the
possessor of the so-called Great Secret; but by reversing the picture, (as the reader will now do,)
he can be seen as viewed by those who have heard him and tested his theory.