Twister Math Twister is a graph of the mathematical function sin(r + theta + delta)*x^2 + cos(r + theta + delta)*y^2, where x and y are standard rectangular coordinates, r and theta are the standard polar coordinates, and delta is a variable that completes one revolution in the course of the video.

Actually, both versions of twister have rotation of coordinates occuring during the course of the MPEG. The first version undergoes a counterclockwise revolution which actually undoes the natural rotation of the function itself, allowing a closer look at the changes occuring within the spiral. The second version does a clockwise rotation which adds to the natural rotation, so it really spins out.

The x and y coordinates are not equal in these graphs: 4 units along the x axis is equal to 3 along the y axis. The unadultered function looked stretched out to me, so I compensated.