Just recently I have discovered another great artist that makes interesting geometrical drawings on sand, earth and ice. Unfortunately, these drawings are eventually erased by waves and weather (winds, rain, etc). I am talking about Jim Denevan. His drawings range in scale from smaller beach compositions to large scale land works the size of a city.

I have picked a couple of great images which have some of the most popular, but also interesting geometrical shapes, patterns.

1. Concentric Circles – circles with a common center. The region between 2 concentric circles of different radii is called an annulus.

Applications: When someone looks at concentric circles, they immediately think of targets (target archery, darts or any other similar sport). Another application can be found in diopter sights, a type of mechanic sights commonly found on target rifles. They usually feature a large disk with a small-diameter hole near the shooter’s eye, and a front globe sight (a circle contained inside another circle, called tunnel). When these sights are correctly aligned, the point of impact will be in the middle of the front sight circle.

2. Spiral – one of the most common pattern found in nature. The mathematical definition is not extremely complicated: a spiral is a curve which emanates from a point, moving farther away as it revolves around the point.

If you want to find out more about him and his work, visit his official website. Hope you enjoyed this short post and it gave you a little flavor for summer and sunny days. Have a great day. You can find me on Facebook,  Tumblr,  Google+,  Twitter   and  Instagram. I will try to post there as often as possible.

Lots of love and don’t forget that maths is everywhere! Enjoy!