Edit: and as to how to get the pink one to stay, it was just some delicate balancing. And the pink one is tilted slightly toward the viewer/left, in other words aside from being (obviously) oriented diagonally, it's also not oriented straight up and down in the other axis. Managed to do it a few times for different attempts, as the first time the pip wasn't riding as high as it could be. The pip just stays on (barely) by friction, btw.