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Also interesting to try to get low percentages. Worst I could get was 53.1% by drawing a rectangle over my whole screen.

2.7% by starting the rectangle close to the dot (it measures deviation from the initial radius)

I got 20% by drawing an ellipse

I got 2.6 for starting close, then circling a big circle, like this https://pasteboard.co/vYFY7MSrgcoD.png