The Sierpinski triangle is a fractal that starts with one triangle, then draws a triangle in the middle. That forms 4 new triangles, and a new triangle is drawn in the middle of every triangle formed except the middle one. This is continued for every "sub-triangle" that is formed. Just change the number of iterations to determine how many times you want to try it, then click the green flag to redraw. It stops at 7 because, beyond that, you can't see more triangles.
Credits to jvvg for the original project!
