Jon Foreman, a Welshman, does these amazing creations on a beach using stones or shells, or just a rake and some string.
It’s about the time it must take to collect the RIGHT stones – construct the array, take photos, then walk away. The next day the array is likely gone, washed away by the waves. He sets to work again.
Do take a look: https://www.thisiscolossal.com/2022/04/jon-foreman-new-land-art/ – each piece is spectacular!