Machu Picchu, Geometry, Online Education

White House Front and Golden Rectangles, Droste Effect, Fibonacci Spiral, HTML5 Animation for Tablets, iPad

Successive Golden Rectangles dividing a Golden Rectangle into squares (logarithmic spiral known as the golden spiral)

White House
The White House is the official residence and principal workplace of the President of the United States, located at 1600 Pennsylvania Avenue Northwest, Washington, D.C.. It has been the residence of every U.S. president since John Adams in 1800.

The house was designed by Irish-born James Hoban, and built between 1792 and 1800 of white-painted Aquia Creek sandstone in the Neoclassical style. Source: Wikipedia: White House.

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.