The Claude glass was an early pocket lens, sans camera, that 18th century men and women would hold aloft to regard the scene over their shoulder.
[imgclear] Its technology is reminiscent of the types of filters and effects one can choose from with Instagram and Hipstamatic: the blackened mirror reduced to tonal values of the image in its reflection and its convex shape brought more of the scene into centre, rendering a tidy snapshot of a larger expanse. [Kottke] [imgclear]