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Droste Effect
technical term for illusions used in these photographs - "effect Droste». This effect has been the name in 1904 in honor of, oddly enough, a package of cocoa brand Droste. The picture shows the effect of Droste, shows a smaller version of himself in the place where these pictures should appear. This smaller version, in turn, shows more small version of himself in the same place, and so on to infinity. If you long to look into these pictures, you can watch up to golovokruzheniya.
Source: www.etoday.ru/2010/01/golovokruzhitel-nij-effekt-dro.php