A fancy mechanical Kinetic sculpture inspired by an illusion wood sculpture.


Kinetic art has been my most important source of inspiration by the previous months. After hours of research to make a kinetic sculpture, I found the yes / no illusion sculpture made in wood by Markus Raetez and was totally fan of that. Then I wanted to rebuild  the concept in Lego.


The original creations made by the artist Markus Raetez was not an kinetic sculpture but a static to. The word yes or no appears depending of where is the viewer, it using the fact that the letters can compose two letter in one using two ways of viewing. You can see the original creations here :

And the videos which showes the result when the viewer is moving :

The creation

Because of the complicated shape of the letters, I have decided to make it moving in order to have the optical illusion. Rather than the viewer moves, it is the letters which move, It enables me to considerably simplify the design of the Y and N letter. Therefore, the principle is simple : 3 moving half-letter which transforms the word yes in no.

Concerning the movements of each letter, I used for that a deformable parallelogram composed of 3 moving beams attached to the frame. The geometry of the beams (placement and lenght) make that the resulting movement is a translation with a 90° rotation on the same horizontal plan, which enables me to move and rotate the letter in order to fit the Y in N, and E and S in O.


In order to move all the parallelograms, I used a simple system of connecting rod with handle. A principal handle motorized by a single M motor with a worm screw on a 40-tooth gear moves a sliding connecting rod attached to the grey beams. Then all letters are linked together with an other system of grey beams visible on the pictures. This solution is very simple, not so effective because of a little delay on the last letter (at the end on the kinematic chains) but is the most simple and compact. The soft spring is to reduced the fits and starts linked to the handle.


The video

More than thousand words : the video of the functioning !

To conclude, I am fascinated by the kinetic art, moving things, and mechanical stuff, so this sculpture is the first of a long set !

Building Instructions

Thorsten Spelz has made the building instructions for my Yes/No Kinetic sculpture based on the dismantling picture I have made ! Therefore I can propose you two instructions, one for free based on photo sequence, and one with professionnal look building made by computer for sale.

Computer Rendered Instructions

You can download the bill of material in html page here : BOM_Kinetic_Sculpture_HTML_Vers (html page – 100ko)

Want to check before if you can build the Kinetic sculpture  ? The Kinetic sculpture has been indexed to Rebrickable.com, the website which matchs your parts with mocs !

By using the next up paypal button, you will get the pro-building instruction in PDF for 5€.

- Get the building instructions for 5€

After your payment, click on “return to MocShop” and wait for the redirection, you will be redirected directly on the PDF file. If you browser can read the PDF, please wait until the end of the download (it can take some minutes) and after save it on your computer. Please Note that this page will be opened only one time so please be patient to download and saves you copy of the PDF. If your browser can not read the PDF, you will be ask to save it directly on your computer. If you have trouble to download your copy of the PDF after payment, please contact me using the “About Page”.

Note that you can print it, but not copy or distribute. Many thank you for supporting my work :)

Sample of the instructions :

Photo Sequence Instructions

Here is the building instructions as a photo sequence :

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