It's a repository of some geometric simulations that I found very interesting.
The fern is one of the basic examples of self-similar sets, i.e. it is a mathematically generated pattern that can be reproducible at any magnification or reduction.
Here it is generated using fractal geometry. More about bernsley fern can be found here
Sierpiński's triangle is an example of fractal geometry. The Sierpinski triangle can be constructed from an equilateral triangle by repeated removal of triangular subsets.
more about Sierpiński's triangle can be found here