Also, I used this model for the cover image of my 2004 book, 'Rendering for Beginners': http://smartcg.com/tech/cg/books/RfB/home/index.html
The book cover is mentioned in this article, which also has more info+links regarding the tribar model: http://mathworld.wolfram.com/PenroseTriangle.html
And, here are my alternate versions of the tribar: http://www.shapeways.com/model/672155/penrose-tribar-with-stand.html and http://www.shapeways.com/model/670170/impossible-tribar.html.
$ United States
White Strong & Flexible
White Strong & Flexible
White Strong & Flexible Polished
Black Strong & Flexible
Coral Red Strong & Flexible Polished
Violet Purple Strong & Flexible Polished
Frosted Ultra Detail
Frosted Detail
White Detail
Black Detail
Transparent Detail
Sandstone
Glazed Ceramics
Pastel Yellow Ceramics
Gloss Black Ceramics
Avocado Green Ceramics
Eggshell Blue Ceramics
Satin Black Ceramics
Silver Glossy
Silver
Stainless Steel
Gold Plated Matte
Gold Plated Glossy
Antique Bronze Matte
Antique Bronze Glossy
Alumide
Polished Alumide
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