Assumption of the Virgin by Titian
Assumption of the Virgin is a large oil painting by Italian Renaissance artist Titian, executed in 1516–1518. It is located on the high altar in the Basilica di Santa Maria Gloriosa dei Frari in Venice, being the largest altarpiece in the city.

Titian
Tiziano Vecelli or Tiziano Vecellio (c. 1488/1490 – 1576 better known as Titian) was an Italian painter, the most important member of the 16th-century Venetian school. Source: Wikipedia, Titian.

Golden rectangle
A golden rectangle is a rectangle whose side lengths are in the golden ratio, one-to-phi, that is, approximately 1:1.618. A distinctive feature of this shape is that when a square section is removed, the remainder is another golden rectangle, that is, with the same proportions as the first. Square removal can be repeated infinitely, which leads to an approximation of the golden or Fibonacci spiral.

Droste Effect
The Droste effect is a specific kind of recursive picture, one that in heraldry is termed mise en abyme. An image exhibiting the Droste effect depicts a smaller version of itself in a place where a similar picture would realistically be expected to appear. This smaller version then depicts an even smaller version of itself in the same place, and so on. Only in theory could this go on forever; practically, it continues only as long as the resolution of the picture allows, which is relatively short, since each iteration geometrically reduces the picture's size. It is a visual example of a strange loop, a self-referential system of instancing which is the cornerstone of fractal geometry. Source: Wikipedia, Droste Effect.