Triangle vortex

A nice rendering of triangle vortex was found at forum WooYah, which was created by member Heidi. This image is interesting by shapes of triangles, which look like Penrose tribar, but they are not. If looking attentively we see that these triangles are more distorted than classic Penrose triangle. So these figures cannot be named 'impossible' because they don't make sense possible figure. It sounds paradoxically, but all impossible figures makes sense common possible object at first glance.

Below you can see another rendering with the same kind of triangle.

Crop circles

Many people think that crop circles are result of UFO landing. They appears in darkest nights and we see their traces on grass fields. I will not dispute this opinion, because nobody contact UFO and wind of helicopter propeller looks more realistic reason of natural simple crop circles formation.

Inspired by natural crop circles enthusiasts croppers create own artificial crop circles. Often the more exact name for artificial crop circles is crop figures because they don't have rounded shape but more complicated. Croppers depict various types of figures such as polygons, fractals, artistic images. Every year contest of circle croppers is being taken at http://www.cropcircleconnector.com/

Below there are some examples of crop circles.

Six ray stars	Julia set
Penrose triangle	Koch snowflake

Impossible triangle in Perth

A 13,5 metres aluminium sculpture of impossible triangle was erected in Perth (Australia) in 1999. It's the biggest sculpture of impossible figure in the world. Many people who live near the sculpture do not suspect that it represents impossible figure because it looks like impossible object from single point of view only.

You can see it at Google maps in the center of the round about. You can clearly see the arms of the triangle going off in different directions.