The week before my 50th birthday, I had a friend who is a house-painter paint this wall of my dining room with teal chalkboard paint. I spent the morning of my birthday drawing this mandala with chalk. I did not use any measuring device except my hands.
Next time I erase the wall and draw a new mandala, I plan to film it in time-lapse, so I’ll be able to post a video shown how it starts at the center and grows outward.