Claude glass: late 18th century mirror carried by tourists. "The device was typically pocket-size, with convex, gray-colored glass. When viewers looked into it, the convex shape pushed more scenery into a single focal point and the color of the glass changed the tones to be more pleasing to the eye by the standards of the contemporary picturesque paintings, which had a limited color palette. The constructed image was thought to be even more beautiful than reality."
The Claude glass was sort-of like the Hipstamatic or Instagram of its day: it presented lived reality as more beautiful and already in its documented form (be it a painting or a faux-vintage photograph). Indeed, there are similarities in style between Claude Lorrain’s paintings, the images seen in the Claude glass and the effects that the faux-vintage photo filters employ.