"The Perfect Medium"

The day before yesterday, the Metropolitan Museum of Art in New York City opened a new temporary exhibit - The Perfect Medium: Photography and the Occult:

The exhibition features about 120 photographs from collections all over the world and arrives in New York after a showing in Paris. Most of the images date from about the 1860s until World War II, a period when people were greatly interested in spiritualism and the paranormal. Using photography to document any images or incidents became a popular way of trying to get proof. [...] The show is divided into three sections. The first features images of "ghosts" or "spirits," while the second section has photographs about mediums and their seances. The third section looks at pictures of what people thought were the vital life forces emanating from human beings.

I must have that poster... The Met's page for The Perfect Medium can be found here.