CAD Puzzles & Riddles

Another penrose triangle:

Grabcad model

Impossible Triangle 2

The Penrose triangle, also known as the Penrose tribar, or the impossible tribar, is a triangular impossible object. It was first created by the Swedish artist Oscar Reutersvärd in 1934.

From some sketches to an impressive illusion:

Grabcad model

"Amazing Animated Optical Illusion"

Found this on Youtube, decided to try it on SolidWorks. It worked, after a few attempts. The original Youtube video (not mine) is here.

Everlasting staircase?

Grabcad model

Impossible staircase

The Penrose stairs, also known as the impossible staircase, is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop. Although the staircase is conceptually impossible, it does interfere with your perception s...

I modelled a Kinetic Illusion for Hardy Meybaum some time ago:

Grabcad model

Wind Dancer in SolidWorks

Inspired by Hardi Maybaum's question: https://grabcad.com/questions/how-to-model-winddancer-with-different-cad-packages, I modelled the Wind Dancer in SolidWorks. The object has some challenging geometry, namely the thin bosses keeping the rings together. They are very hard to model nicely, becau...

That could have been the inspiration for the model posted above...

Very good.

They are not quite the same, but on the idea of Kinetic Art, check out http://www.woodthatworks.com/

Deja Vu is my favorite model currently for sale (just in case anyone was wondering what to get me as a gift).

That Deja Vu thingy is amazing, but I think that I would fall off the couch if I looked at it for a sustained period of time. It makes my head spin!

Just made another version of the Penrose Triangle:

Grabcad model

Adobe Reader's Logo

After checking some Penrose triangles, I thought of making mine unique... This is - obviously - an optical illusion. Check the 3D viewer yourself. It is also made in only 1 step! Tell me in the comments which one do you think is better: Mine or Adobe's? Modelled with SolidWorks 2016 Rendered with...

What do you think?

I don't think the Adobe logo is an optical illusion, but it definitely is a good 3D modeling challenge.  To do it in one step is pretty good.

Check the 3D viewer to know why it is...