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.