Warning! If you only believe in your eyes, your brain can be easily deceived! Post #3 - Spidrons

This article is not only about the illusion, but the beauty of mathematics, including geometry. When I was a student of Hungarian Academy of arts and Design, we used to work a lot with geometry. I folded many paper models, then made plaster molds for glass fusing technique. Unfortunately all of my works has damaged, but I can reconstruate them any time.
That time I haven't heard about spidrons, which are very special geometric shapes. To tell the truth, I re-discovered them, but in the absence of time, I did not develop them further.
About ten years ago, I found a website with almost the same forms, made by Dániel Erdély, the world-famous Ernő Rubik's student, who also attended to the Hungarian Academy of Arts and Design, about 10 years before me. No need to say, I was very surprised :)))
***/
What is a spidron?
In geometry, a spidron is a continuous flat geometric figure composed entirely of triangles, where, for every pair of joining triangles, each has a leg of the other as one of its legs, and neither has any point inside the interior of the other. A deformed spidron is a three-dimensional figure sharing the other properties of a specific spidron, as if that spidron were drawn on paper, cut out in a single piece, and folded along a number of legs. (Wikipedia)

---

Let's have a look:

http://tetrahedral.blogspot.hu/2011/03/spidrons.html

It's just a plane figure that can be transformed to a flexible 3D shape!

I made a simple paper model:

Other beautiful examples:

(litera.hu)

(pinterest.com)

(http://www.rinusroelofs.nl/structure/spidron/spidron-04.html)

(pinterest.com)

---

To be continued...

Áldás!♥♥♥Blessings!♥♥♥Namaste!♥♥♥Aloha!