In 1915 Gimpel befriended a group of children from the Grenata Street neighborhood in Paris who had established their own “army”. He began to visit them regularly on Sundays, helping them to build their arsenal from whatever was to hand, providing direction in “casting”, and recording with his camera the army’s triumphs over the evil enemy, the Boche.
Gimpel was charmed by these children and came to know each of them well: the “chief”, the eldest in the garrison; his friend, who was conscripted to play the unenviable role of the Boche; and Pépète, who was “small, slightly misshaped, rather scrofulous, looking somewhat like a gnome” but who nonetheless played the part of an ace aviator. At the end of each session, Gimpel would reward the troops with barley sugar, causing all to shout with one voice, “Long live the photograph!”
There are many different ways of creating and viewing stereoscopic 3D images but they all rely on independently presenting different images to the left and right eye.
Anaglyphs are a straightforward way of presenting stereo pair images is the stereoscopic 3D effect achieved by means of encoding each eye’s image using filters of different (usually chromatically opposite) colors, typically red and cyan. Anaglyph 3D images contain two differently filtered colored images, one for each eye. When viewed through the “color-coded” “anaglyph glasses”, each of the two images reaches the eye it’s intended for, revealing an integrated stereoscopic image. The visual cortex of the brain fuses this into the perception of a three-dimensional scene or composition.
There are three types of anaglyph glasses in common use: red-blue, red-cyan, and red-green.