The "particles" demo is a great show piece to illustrate that Python is totally capable of smooth, real-time animation. But today when I was showing it to someone, I was dismayed to see that it was just drawing the particle effect in the lower left hand corner of the screen. It seems that copy.copy(Point) now returns a point at 0, 0 regardless of what its values were. I later fixed the demo locally by switching it to use Point(location.x, location.y) but it would be nice if this worked out of the box.