Pascal's triangles in HTML5

I did this animation in Flash long time ago, but I wanted to see it on my iPhone so I ported it to JavaScript using canvas and web audio.

The animation is a Pascal triangle reflected in the X and Y axis, where the empty cells are the numbers that are divisible by some random number (not prime) selected for every drawing pass, and the cells in colors are randomly colored accordingly to their residue by the same random number. The source code has all the nitty-gritty details.

The standalone version with music can be found here.

Mathematical art

Once upon a time, I considered myself a decent painter. I remember getting second place in some magazine for some Christmas teenagers contest and spending a whole summer painting furiously at my home in the highlands. But, truth be said, I'm awful compared with the professional painters and artists I have found working as a game developer. Most of my art prodigies are forever lost now, maybe for good, but I remember painting something like this when I was entranced on my abstract expressionism period:

IMO 1979 Problem 3

I "solved" another International Mathematical Olympiads problem:

There are two circles in the plane. Let a point A be one of the points of intersection of these circles.
Two points begin moving simultaneously with constant speeds from the point A, each point along its own circle.
The two points return to the point A at the same time.
Prove that there is a point P in the plane such that at every moment of time 
the distance from the point P to the moving points are equal.

The demo below draws all the lines that satisfy the condition while the points are moving, if there is such a point P then our lines must intersect in that point.

r (R1/R2)

q [R1 - R2, R1 + R2]

Move

Inverse direction

The source code can be found here: http://github.com/ex/js
And the stand alone demo can be viewed here: http://ex.github.io/js/src/imo_1979_3/