Droste effect
n.β Β«At my grocery store I could only find three examples: Land OβLakes Butter, Morton Salt and Cracker Jacks. These packages each include a picture of the package itself and are often cited by writers discussing such pop-math-arcana as recursion, strange loops, self-similarity, and fractals. This particular phenomenon, known as the βDroste effect,β is named after a 1904 package of Droste brand cocoa.Β» ββDroste Effect Packaging” box vox Apr. 12, 2008. (source: Double-Tongued Dictionary)