This model is also called the 'Penrose Triangle'. The configuration is impossible to create in 3D, using full cubes (with all 6 sides intact for each cube). What you are looking at is an optical illusion, where only 3 adjacent-to-each-other walls from each cube are included, and the inside concave corners masquerade as external convex ones :)

Also, I used this model for the cover image of my 2004 book, 'Rendering for Beginners':

The book cover is mentioned in this article, which also has more info+links regarding the tribar model:

And, here are my alternate versions of the tribar: and


IN: 2.504 w x 2.171 d x 0.622 h
CM: 6.36 w x 5.514 d x 1.58 h


Sign In or Join to comment.


We're sorry to inform you that we no longer support this browser and can't confirm that everything will work as expected. For the best Shapeways experience, please use one of the following browsers:

Click anywhere outside this window to continue.