Drop the needles on the paper and calculate the percentage that fall on a line. With enough attempts, the answer should be the needle length divided by the width between lines, all multiplied by 2/pi.

But in the 1990s something dramatic happened, and the needle went way past the red line.

Having spent 500 hours under the needle in the past 20 years, Varley has almost every square cm of her body decorated, but she draws the line at having her face tattooed. see.