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Re:The Art of Mathematics in Chalk by tzs on Saturday April 24, 2021 @05:49PM (#26928473)
There are actually people who can quickly draw really good circles.

Here's a video of Alexander Overwijk, who has won the World Freehand Circle Drawing Championship numerous times, drawing a circle [1].

Here's Michael Clauss, who ended a streak of 9 consecutive Overwijk wins [2].

Here's some footage of the first World Freehand Circle Drawing Championship in 2007, showing several different contestents [3].

[1] https://www.youtube.com/watch?v=eAhfZUZiwSE

[2] https://www.youtube.com/watch?v=m9NgVbEhe44

[3] https://www.youtube.com/watch?v=u1J5ANnq0T8

Re:The Art of Mathematics in Chalk by d0mine on Sunday April 25, 2021 @04:56AM (#26931331)
“Giotto used the perfect circle to demonstrate the level of artistry he earned” http://theorbitbrown.com/site/the-perfect-circle/ sometimes it is attributed to Michelangelo or Leonardo da Vinci